Update AEM and Cortex Models versions

AEMv8-A Model release v8.4 has been made available and Trusted Firmware
has been tested against these versions as part of its CI system. This
patch updates the user guide documentation to reflect the version of AEM
and Cortex Models that Trusted Firmware has been tested against.

Additionally, ARM FVPs FVP_Base_Cortex-A57x1-A53x1 and
FVP_Base_Cortex-A57x2-A53x4 are removed from the list of tested FVPs
as they are currently not being tested with the latest version of ARM
Trusted Firmware.

Also, documentation and links to Linaro pages have been updated to
reflect the changes in the ARM community document hosting.

Change-Id: Idae97303ce0929c82b137017de84ce94678f6f2b
Signed-off-by: David Cunado <david.cunado@arm.com>

docs/user-guide.md

@@ -69,8 +69,10 @@ command:
 
     sudo apt-get install build-essential gcc make git libssl-dev
 
-Download and install the AArch64 little-endian GCC cross compiler as indicated
-in the [Linaro instructions][Linaro SW Instructions].
+Download and install the AArch32 or AArch64 little-endian GCC cross compiler.
+The [Linaro Release Notes][Linaro Release Notes] documents which version of the
+compiler to use for a given Linaro Release. Also, these
+[Linaro instructions][Linaro SW Instructions] provide further guidance.
 
 In addition, the following optional packages and tools may be needed:
 
@@ -1152,15 +1154,13 @@ The latest version of the AArch64 build of ARM Trusted Firmware has been tested
 on the following ARM FVPs (64-bit host machine only).
 
 *   `Foundation_Platform` (Version 10.2, Build 10.2.20)
-*   `FVP_Base_AEMv8A-AEMv8A` (Version 8.2, Build 0.8.8202)
-*   `FVP_Base_Cortex-A57x4-A53x4` (Version 8.2, Build 0.8.8202)
-*   `FVP_Base_Cortex-A57x1-A53x1` (Version 8.2, Build 0.8.8202)
-*   `FVP_Base_Cortex-A57x2-A53x4` (Version 8.2, Build 0.8.8202)
+*   `FVP_Base_AEMv8A-AEMv8A` (Version 8.4, Build 0.8.8402)
+*   `FVP_Base_Cortex-A57x4-A53x4` (Version 8.4, Build 0.8.8402)
 
 The latest version of the AArch32 build of ARM Trusted Firmware has been tested
 on the following ARM FVPs (64-bit host machine only).
 
-*   `FVP_Base_AEMv8A-AEMv8A` (Version 8.2, Build 0.8.8202)
+*   `FVP_Base_AEMv8A-AEMv8A` (Version 8.4, Build 0.8.8402)
 *   `FVP_Base_Cortex-A32x4` (Version 10.1, Build 10.1.32)
 
 NOTE: The build numbers quoted above are those reported by launching the FVP
@@ -1495,9 +1495,8 @@ _Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved._
 [ARM FVP website]:             https://developer.arm.com/products/system-design/fixed-virtual-platforms
 [Linaro Release Notes]:        https://community.arm.com/tools/dev-platforms/b/documents/posts/linaro-release-notes-deprecated
 [ARM Platforms Portal]:        https://community.arm.com/groups/arm-development-platforms
-[Linaro SW Instructions]:      https://community.arm.com/docs/DOC-10803
-[Juno Instructions]:           https://community.arm.com/docs/DOC-10804
-[FVP Instructions]:            https://community.arm.com/docs/DOC-10831
+[Linaro SW Instructions]:      https://community.arm.com/dev-platforms/b/documents/posts/instructions-for-using-the-linaro-software-deliverables
+[Juno Instructions]:           https://community.arm.com/dev-platforms/b/documents/posts/using-linaros-deliverables-on-juno
 [Juno Getting Started Guide]:  http://infocenter.arm.com/help/topic/com.arm.doc.dui0928e/DUI0928E_juno_arm_development_platform_gsg.pdf
 [DS-5]:                        http://www.arm.com/products/tools/software-tools/ds-5/index.php
 [mbed TLS Repository]:         https://github.com/ARMmbed/mbedtls.git