target: rename splash screen display configuration functions

Display initialization and shutdown functions for specific MSM targets
are defined in the corresponding target folders.  However, these
functions share the same name as the generic display_init and
display_shutdown function defined as the platform level api.
Rename these to target_display_init and target_display_shutdown to
be in line with the other target specific APIs.

Change-Id: I63797952182315f1006e22ec47e08a25a786daa4
diff --git a/include/target.h b/include/target.h
index 45f1605..2d9fb93 100644
--- a/include/target.h
+++ b/include/target.h
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2008 Travis Geiselbrecht
  *
- * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2013-2014, 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
@@ -51,5 +51,6 @@
 struct mmc_device *target_mmc_device();
 
 bool target_display_panel_node(char *pbuf, uint16_t buf_size);
-
+void target_display_init(void);
+void target_display_shutdown(void);
 #endif