platform: Add new api to get MSM_SHARED_BASE

Add a new api to get MSM_SHARED_BASE address from platform.
MSM_SHARED_BASE address is dependent on platform subtype and
hence is different for some platform variants.

Change-Id: I307d2110984e788aeeac2bcaa9f185ce2e2c92f4
diff --git a/include/platform.h b/include/platform.h
index aa63431..b427b04 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -1,6 +1,8 @@
 /*
  * Copyright (c) 2008 Travis Geiselbrecht
  *
+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files
  * (the "Software"), to deal in the Software without restriction,
@@ -53,5 +55,5 @@
 void platform_uninit_timer(void);
 void reboot_device(unsigned);
 int set_download_mode(enum dload_mode mode);
-
+uint32_t platform_get_smem_base_addr();
 #endif