refactor(mte): rename CTX_INCLUDE_MTE_REGS

Move CTX_INCLUDE_MTE_REGS to ENABLE_FEAT_MTE

Change-Id: Id73c6497baec9d6247bd7572858bdb99c8c7a350
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
diff --git a/tf_config/fvp-spm b/tf_config/fvp-spm
index f370e60..6e6dfb8 100644
--- a/tf_config/fvp-spm
+++ b/tf_config/fvp-spm
@@ -5,7 +5,7 @@
 CTX_INCLUDE_EL2_REGS=1
 ARM_ARCH_MINOR=5
 CTX_INCLUDE_PAUTH_REGS=1
-CTX_INCLUDE_MTE_REGS=1
+ENABLE_FEAT_MTE=1
 BRANCH_PROTECTION=1
 SP_LAYOUT_FILE=${tftf_root}/build/fvp/${bin_mode}/sp_layout.json
 GIC_EXT_INTID=1