platform: msm_shared: add support for ATP platform.

Change to add support for ATP platform.

Change-Id: I7c23c31a06e3c9887f691ee97c35845a348b0f0a
diff --git a/platform/msm_shared/smem.c b/platform/msm_shared/smem.c
index 8c2e5cc..3a76738 100644
--- a/platform/msm_shared/smem.c
+++ b/platform/msm_shared/smem.c
@@ -55,6 +55,7 @@
 	[HW_PLATFORM_DTV] = "DTV",
 	[HW_PLATFORM_STP] = "STP",
 	[HW_PLATFORM_SBC] = "SBC",
+	[HW_PLATFORM_ATP] = "ATP",
 };
 
 /* DYNAMIC SMEM REGION feature enables LK to dynamically