feat(neoverse-rd): disable SPMD_SPM_AT_SEL2 for A75/V1/N1 platforms

SPMD_SPM_AT_SEL2 is enabled by default for platforms. As the platforms
based on A75/V1/N1 CPUs don't use SPMD_SPM_AT_SEL2, set its value to 0.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Change-Id: I59703ddd769f61778ea06cc183e1b163369281f1
diff --git a/plat/arm/board/neoverse_rd/platform/rdn1edge/platform.mk b/plat/arm/board/neoverse_rd/platform/rdn1edge/platform.mk
index 1a4e288..f2a9558 100644
--- a/plat/arm/board/neoverse_rd/platform/rdn1edge/platform.mk
+++ b/plat/arm/board/neoverse_rd/platform/rdn1edge/platform.mk
@@ -74,6 +74,7 @@
 endif
 
 override CTX_INCLUDE_AARCH32_REGS	:= 0
+override SPMD_SPM_AT_SEL2		:= 0
 
 # Enable the flag since RD-N1-EDGE has a system level cache
 NEOVERSE_Nx_EXTERNAL_LLC		:=	1
diff --git a/plat/arm/board/neoverse_rd/platform/rdv1/platform.mk b/plat/arm/board/neoverse_rd/platform/rdv1/platform.mk
index 59e732d..fe87779 100644
--- a/plat/arm/board/neoverse_rd/platform/rdv1/platform.mk
+++ b/plat/arm/board/neoverse_rd/platform/rdv1/platform.mk
@@ -59,6 +59,7 @@
 
 override CTX_INCLUDE_AARCH32_REGS	:= 0
 override ENABLE_FEAT_AMU		:= 2
+override SPMD_SPM_AT_SEL2		:= 0
 
 ifneq ($(NRD_PLATFORM_VARIANT),0)
  $(error "NRD_PLATFORM_VARIANT for RD-V1 should always be 0, \
diff --git a/plat/arm/board/neoverse_rd/platform/rdv1mc/platform.mk b/plat/arm/board/neoverse_rd/platform/rdv1mc/platform.mk
index 096848e..a0a1204 100644
--- a/plat/arm/board/neoverse_rd/platform/rdv1mc/platform.mk
+++ b/plat/arm/board/neoverse_rd/platform/rdv1mc/platform.mk
@@ -70,6 +70,7 @@
 
 override CTX_INCLUDE_AARCH32_REGS	:= 0
 override ENABLE_FEAT_AMU		:= 2
+override SPMD_SPM_AT_SEL2		:= 0
 
 ifneq ($(NRD_PLATFORM_VARIANT),0)
  $(error "NRD_PLATFORM_VARIANT for RD-V1-MC should always be 0, \
diff --git a/plat/arm/board/neoverse_rd/platform/sgi575/platform.mk b/plat/arm/board/neoverse_rd/platform/sgi575/platform.mk
index 90d499e..e51014b 100644
--- a/plat/arm/board/neoverse_rd/platform/sgi575/platform.mk
+++ b/plat/arm/board/neoverse_rd/platform/sgi575/platform.mk
@@ -66,3 +66,5 @@
  $(error "NRD_PLATFORM_VARIANT for SGI575 should always be 0,\
      currently set to ${NRD_PLATFORM_VARIANT}.")
 endif
+
+override SPMD_SPM_AT_SEL2		:= 0