platform: msm_shared: correct the packed attribute

Should be __PACKED instead of __packed in lk.

Change-Id: I18fb559d271050b3ee90acd337f5bd2d308b17de
diff --git a/platform/msm_shared/include/scm.h b/platform/msm_shared/include/scm.h
index 2c5e14b..1614a95 100644
--- a/platform/msm_shared/include/scm.h
+++ b/platform/msm_shared/include/scm.h
@@ -152,7 +152,7 @@
 struct tz_prng_data {
 	uint8_t *out_buf;
 	uint32_t out_buf_size;
-}__packed;
+}__PACKED;
 
 /* SCM support as per ARM spec */
 /*