fix: bump up the stack size

This patch increases the per-CPU stack to 5 pages.
This is due to increased stack usage when
RMM_FPU_USE_AT_REL2=ON causing stack overflow.

Signed-off-by: Soby Mathew <soby.mathew@arm.com>
Change-Id: I8b98f87b70dd7186f0a3b0a75504aed89bb53122

runtime/CMakeLists.txt

@@ -23,7 +23,7 @@ arm_config_option(
     NAME RMM_NUM_PAGES_PER_STACK
     HELP "Number of pages to use per CPU stack"
     TYPE STRING
-    DEFAULT 4
+    DEFAULT 5
     ADVANCED)
 
 target_compile_definitions(rmm-runtime