feat(plat/arm): Introduce the common arm platform

This patch introduced the common arm platform which can be used
by any compatible hardware. This allows reuse of code across multiple
platforms and possibly a single binary which can run on these platforms.
This depends on the MAX_CPU and RMM_MAX_GRANULES and RMM_MAX_SIZE can
encompass the superset of the values.

Signed-off-by: Harry Moulton <harry.moulton@arm.com>
Signed-off-by: Soby Mathew <soby.mathew@arm.com>
Change-Id: I69ceea101595f0e8cac81bd9e4d8754d2b1edbc3
diff --git a/cmake/CommonConfigs.cmake b/cmake/CommonConfigs.cmake
index d212c06..ea517a3 100644
--- a/cmake/CommonConfigs.cmake
+++ b/cmake/CommonConfigs.cmake
@@ -48,9 +48,7 @@
     NAME RMM_FPU_USE_AT_REL2
     HELP "Enable Advanced SIMD support in RMM"
     TYPE BOOL
-    DEFAULT ON
-    DEPENDS (RMM_ARCH STREQUAL aarch64)
-    ELSE OFF)
+    DEFAULT OFF)
 
 #
 # The number of 4K pages allocated for attestation buffer.