fix(rdv3): remove NEED_* from RD-V3 makefile

As the NEED_* are internal flags used in the build system and are not
meant to be used by platforms, remove them from the RD-V3 makefile.

Signed-off-by: Jaylyn Ren <Jaylyn.Ren2@arm.com>
Change-Id: If7144b9d72c16e8025f929f2546abd96194615ce
diff --git a/plat/arm/board/neoverse_rd/platform/rdv3/platform.mk b/plat/arm/board/neoverse_rd/platform/rdv3/platform.mk
index 7d770f5..da96730 100644
--- a/plat/arm/board/neoverse_rd/platform/rdv3/platform.mk
+++ b/plat/arm/board/neoverse_rd/platform/rdv3/platform.mk
@@ -21,12 +21,6 @@
 override ARM_ARCH_MAJOR			:= 8
 override ARM_ARCH_MINOR			:= 7
 
-# Image flags
-override NEED_BL1			:= yes
-override NEED_BL2			:= yes
-override NEED_BL32			:= no
-override NEED_RMM			:= no
-
 # Misc options
 override CTX_INCLUDE_AARCH32_REGS	:= 0