allow endian selecton for qemu aarch64

target/config/Config.in.endian

@@ -16,6 +16,7 @@ depends on ADK_TARGET_SYSTEM_GENERIC_ARC \
 	|| ADK_TARGET_SYSTEM_GENERIC_SH \
 	|| ADK_TARGET_SYSTEM_GENERIC_XTENSA \
 	|| ADK_TARGET_SYSTEM_SYNOPSYS_NSIM \
+	|| ADK_TARGET_SYSTEM_QEMU_AARCH64 \
 	|| ADK_TARGET_SYSTEM_QEMU_MICROBLAZE_ML605 \
 	|| ADK_TARGET_SYSTEM_QEMU_MICROBLAZE_S3ADSP1800 \
 	|| ADK_TARGET_SYSTEM_QEMU_MIPS \