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Add board support for RD-N2 Cfg1 variant of RD-N2 platform. It is a
variant of RD-N2 platform with a reduced interconnect mesh size (3x3)
and core count (8-cores). Its platform variant id is 1.

Change-Id: I34ad35c5a5c1e9b69a658fb92ed00e5bc5fe72f3
Signed-off-by: Aditya Angadi <aditya.angadi@arm.com>

A Neoverse reference design platform can have two or more variants that
differ in core count, cluster count or other peripherals. To allow reuse
of platform code across all the variants of a platform, introduce build
option CSS_SGI_PLATFORM_VARIANT for Arm Neoverse reference design
platforms. The range of allowed values for the build option is platform
specific. The recommended range is an interval of non negative integers.

An example usage of the build option is
make PLAT=rdn2 CSS_SGI_PLATFORM_VARIANT=1

Change-Id: Iaae79c0b4d0dc700521bf6e9b4979339eafe0359
Signed-off-by: Aditya Angadi <aditya.angadi@arm.com>

Update TZC base address to align with the recent changes in the platform
memory map.
Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>
Change-Id: I0d0ad528a2e236607c744979e1ddc5c6d426687a

AMU counters are used for monitoring the CPU performance. RD-N2 platform
has architected AMU available for each core. Enable the use of AMU by
non-secure OS for supporting the use of counters for processor
performance control (ACPI CPPC).

Change-Id: I5cc749cf63c18fc5c7563dd754c2f42990a97e23
Signed-off-by: Pranav Madhu <pranav.madhu@arm.com>

RD-N2 platform has been updated to use six GIC ITS blocks. This results
in change in base address of the GIC Redistributor to accomodate two
new GIC ITS blocks. Update the base address of GICR to reflect the same.
Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>
Change-Id: I740a547328fb9a9f25d7a09c08e61bdbc8bf781c

Add the initial board support for RD-N2 platform.

Change-Id: I8325885bf248dd92191d6fc92a2da91c23118f8c
Signed-off-by: Aditya Angadi <aditya.angadi@arm.com>