qemu_v8: Replace CFG_VIRTUALIZATION with CFG_NS_VIRTUALIZATION

Replace CFG_VIRTUALIZATION with CFG_NS_VIRTUALIZATION which was marked
as deprecated after below optee_os commit.

9bc42f66f680 ("mk: config: clarify CFG_VIRTUALIZATION is deprecated")

Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/qemu_v8.mk b/qemu_v8.mk
index 302f8d1..fe1869b 100644
--- a/qemu_v8.mk
+++ b/qemu_v8.mk
@@ -342,7 +342,7 @@
 OPTEE_OS_COMMON_FLAGS_SPMC_AT_EL_3 += CFG_CORE_RESERVED_SHM=n
 
 ifeq ($(XEN_BOOT),y)
-OPTEE_OS_COMMON_FLAGS += CFG_VIRTUALIZATION=y
+OPTEE_OS_COMMON_FLAGS += CFG_NS_VIRTUALIZATION=y
 endif
 
 ifeq ($(PAUTH),y)