Further renames of platform porting functions

Rename the ic_* platform porting functions to plat_ic_* to be
consistent with the other functions in platform.h. Also rename
bl31_get_next_image_info() to bl31_plat_get_next_image_ep_info()
and remove the duplicate declaration in bl31.h.

Change-Id: I4851842069d3cff14c0a468daacc0a891a7ede84
diff --git a/services/spd/tspd/tspd_main.c b/services/spd/tspd/tspd_main.c
index 1dbe6ba..da40ea3 100644
--- a/services/spd/tspd/tspd_main.c
+++ b/services/spd/tspd/tspd_main.c
@@ -160,7 +160,7 @@
 	 * absence is a critical failure.  TODO: Add support to
 	 * conditionally include the SPD service
 	 */
-	image_info = bl31_get_next_image_info(SECURE);
+	image_info = bl31_plat_get_next_image_ep_info(SECURE);
 	assert(image_info);
 
 	/*