feat(mte): adds feature detection for MTE_PERM

Adds feature detection for v8.9 feature FEAT_MTE_PERM. Adds respective
ID_AA64PFR2_EL1 definitions and ENABLE_FEAT_MTE_PERM define.

Change-Id: If24b42f1207154e639016b0b840b2d91c6ee13d4
Signed-off-by: Maksims Svecovs <maksims.svecovs@arm.com>
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/plat/arm/board/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index 436cab3..7df150e 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -80,6 +80,7 @@
 ENABLE_FEAT_CSV2_2		:= 2
 ENABLE_FEAT_DIT			:= 2
 ENABLE_FEAT_PAN			:= 2
+ENABLE_FEAT_MTE_PERM		:= 2
 ENABLE_FEAT_VHE			:= 2
 CTX_INCLUDE_NEVE_REGS		:= 2
 ENABLE_FEAT_SEL2		:= 2