platform: msm_shared: Add support for msm8940

Add smem entry for 8940. Add support for msm8940 in platform
selection logic.

Change-Id: Iabc046f8c6b5c968c273f0c0e428291cec55b46b
diff --git a/platform/msm_shared/smem.h b/platform/msm_shared/smem.h
index d2e67d8..50193bd 100644
--- a/platform/msm_shared/smem.h
+++ b/platform/msm_shared/smem.h
@@ -447,6 +447,7 @@
 	MSM8953  = 293,
 	MSM8937 = 294,
 	APQ8037 = 295,
+	MSM8940 = 313,
 	MSM8996L = 302,
 	MSM8917  = 303,
 	APQ8053 = 304,