Change the default driver to GICv3 in FVP

This patch changes the default driver for FVP platform from the deprecated
GICv3 legacy to the GICv3 only driver. This means that the default build of
Trusted Firmware will not be able boot Linux kernel with GICv2 FDT blob. The
user guide is also updated to reflect this change of default GIC driver for
FVP.

Change-Id: Id6fc8c1ac16ad633dabb3cd189b690415a047764

docs/user-guide.md

@@ -1013,22 +1013,22 @@ all FDTs are available from there.
 
 *   `fvp-base-gicv2-psci.dtb`
 
-    (Default) For use with both AEMv8 and Cortex-A57-A53 Base FVPs with
+    For use with both AEMv8 and Cortex-A57-A53 Base FVPs with
     Base memory map configuration.
 
 *   `fvp-base-gicv3-psci.dtb`
 
-    For use with both AEMv8 and Cortex-A57-A53 Base FVPs with Base memory map
-    configuration and Linux GICv3 support.
+    (Default) For use with both AEMv8 and Cortex-A57-A53 Base FVPs with Base
+    memory map configuration and Linux GICv3 support.
 
 *   `fvp-foundation-gicv2-psci.dtb`
 
-    (Default) For use with Foundation FVP with Base memory map configuration.
+    For use with Foundation FVP with Base memory map configuration.
 
 *   `fvp-foundation-gicv3-psci.dtb`
 
-    For use with Foundation FVP with Base memory map configuration and Linux
-    GICv3 support.
+    (Default) For use with Foundation FVP with Base memory map configuration
+    and Linux GICv3 support.
 
 ### Running on the Foundation FVP with reset to BL1 entrypoint
 

plat/arm/board/fvp/platform.mk

@@ -28,8 +28,8 @@
 # POSSIBILITY OF SUCH DAMAGE.
 #
 
-# Use the Legacy GICv3 driver on the FVP by default to maintain compatibility.
-FVP_USE_GIC_DRIVER	:= FVP_GICV3_LEGACY
+# Use the GICv3 driver on the FVP by default
+FVP_USE_GIC_DRIVER	:= FVP_GICV3
 
 # The FVP platform depends on this macro to build with correct GIC driver.
 $(eval $(call add_define,FVP_USE_GIC_DRIVER))