platform: msm_shared: Add chip id for 8909 variant

Add chip id for 8909 variant, MSM8609.

Change-Id: I873a8b4cb0c236715de12d747ef451fbfb0da11b
diff --git a/platform/msm_shared/smem.h b/platform/msm_shared/smem.h
index ab7de2b..db186d4 100644
--- a/platform/msm_shared/smem.h
+++ b/platform/msm_shared/smem.h
@@ -406,6 +406,7 @@
 	MSM8629  = 269,
 	MSM8229  = 270,
 	APQ8029  = 271,
+	MSM8609  = 275,
 	FSM9916  = 276,
 };