feat(rdn2): enable Neoverse N2 CPU error handling support

Defines N2 CPU RAS error for RD-N2 platform variants. Enables N2 CPU
error handling on RD-N2 platform variants.

Signed-off-by: Omkar Anand Kulkarni <omkar.kulkarni@arm.com>
Change-Id: If9378064c41e0d14e6c789c71f8def594f89e220
diff --git a/plat/arm/board/rdn2/platform.mk b/plat/arm/board/rdn2/platform.mk
index 9ebca23..1506714 100644
--- a/plat/arm/board/rdn2/platform.mk
+++ b/plat/arm/board/rdn2/platform.mk
@@ -72,7 +72,8 @@
 ifeq (${RAS_FFH_SUPPORT},1)
 BL31_SOURCES		+=	${RDN2_BASE}/rdn2_ras.c			\
 				${CSS_ENT_BASE}/ras/sgi_ras_common.c	\
-				${CSS_ENT_BASE}/ras/sgi_ras_sram.c
+				${CSS_ENT_BASE}/ras/sgi_ras_sram.c	\
+				${CSS_ENT_BASE}/ras/sgi_ras_cpu.c
 endif
 
 # Add the FDT_SOURCES and options for Dynamic Config