mte: add mte2 to test builds

SCR_EL3.ATA bit setting is now moved under FEAT_MTE2
So enable that for testing MTE features.

Change-Id: If699869bff28347c67085f5f4d7eab04be93064b
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
diff --git a/tf_config/fvp-mte-tsp b/tf_config/fvp-mte-tsp
index 2e7d13a..4b6b985 100644
--- a/tf_config/fvp-mte-tsp
+++ b/tf_config/fvp-mte-tsp
@@ -1,4 +1,5 @@
 CROSS_COMPILE=aarch64-none-elf-
 ENABLE_FEAT_MTE=1
+ENABLE_FEAT_MTE2=1
 PLAT=fvp
 SPD=tspd