feat(rdv3): set CTX_INCLUDE_SVE_REGS build flag for RD-V3 variants

Commit 4242262(feat(simd):add sve state to simd ctxt struct)
introduced the CTX_INCLUDE_SVE_REGS build flag that needs to be set
if SVE is enabled for more than one world, which is the case for
RD-V3. This build flag enables SVE registers to be included when
saving and restoring the CPU context.

Change-Id: Ic491939061e42e8c87a805ded99e271308f90352
Signed-off-by: Gautham Ravichandran <gautham.ravichandran@arm.com>

plat/arm/board/neoverse_rd/platform/rdv3/platform.mk

@@ -131,3 +131,4 @@ override ENABLE_FEAT_AMU	:= 2
 override ENABLE_SVE_FOR_SWD	:= 1
 override ENABLE_SVE_FOR_NS	:= 2
 override ENABLE_FEAT_MTE2	:= 2
+override CTX_INCLUDE_SVE_REGS	:= 1