qemu_v8: use ENABLE_SME_FOR_NS=2 in TF_A_FLAGS

Uses ENABLE_SME_FOR_NS=2 in TF_A_FLAGS to let TF-A probe if SME is
enabled or not.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
diff --git a/qemu_v8.mk b/qemu_v8.mk
index 67347b8..1fffecd 100644
--- a/qemu_v8.mk
+++ b/qemu_v8.mk
@@ -169,6 +169,7 @@
 	PLAT=qemu \
 	QEMU_USE_GIC_DRIVER=$(TFA_GIC_DRIVER) \
 	ENABLE_SVE_FOR_NS=2 \
+	ENABLE_SME_FOR_NS=2 \
 	ENABLE_SVE_FOR_SWD=1 \
 	ENABLE_SME_FOR_SWD=1 \
 	ENABLE_FEAT_FGT=2 \