platform: msm_shared: Change target name from zirc to 9640

Add support for renaming zirc to 9640

Change-Id: I8c5433d60b63b5a8fed25bfef5246288cc616431
diff --git a/platform/msm_shared/smem.h b/platform/msm_shared/smem.h
index 41d0dc0..254d6a4 100644
--- a/platform/msm_shared/smem.h
+++ b/platform/msm_shared/smem.h
@@ -373,7 +373,7 @@
 	MSM8510  = 225,
 	MSM8512  = 226,
 	MSM8936  = 233,
-	MSMZIRC  = 234,
+	MDM9640  = 234,
 	MSM8939  = 239,
 	APQ8036  = 240,
 	APQ8039  = 241,