msm: uart/gsbi driver update

AP8064 does not share the same gsbi address mappings
as well as offsets with MSM8960. As such, addresses have to be
passed at run time instead of compile time for single binary image.

Change-Id: I204efaffcd7e5502bbd980865a77568f5063beac
diff --git a/include/platform.h b/include/platform.h
index cff84c3..309bfef 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -40,6 +40,7 @@
 void display_image_on_screen(void);
 
 unsigned board_machtype(void);
+unsigned board_platform_id(void);
 unsigned check_reboot_mode(void);
 void platform_uninit_timer(void);
 void reboot_device(unsigned);