include: Add function prototype for detecting panel

Add function prototype for detecting panel ad HD,720p,
qHD,etc.

Change-Id: I209f2c5a2c9d3afdcd330b3db6005d736c3b918f
diff --git a/include/platform.h b/include/platform.h
index c2fac94..a239567 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -62,4 +62,5 @@
 int platform_is_msm8939();
 int platform_is_msm8909();
 int boot_device_mask(int);
+uint32_t platform_detect_panel();
 #endif