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/plat/fvp/bl31_fvp_setup.c b/plat/fvp/bl31_fvp_setup.c
index d867fba..5169bd7 100644
--- a/plat/fvp/bl31_fvp_setup.c
+++ b/plat/fvp/bl31_fvp_setup.c
@@ -88,7 +88,7 @@
  * while BL32 corresponds to the secure image type. A NULL pointer is returned
  * if the image does not exist.
  ******************************************************************************/
-entry_point_info_t *bl31_get_next_image_info(uint32_t type)
+entry_point_info_t *bl31_plat_get_next_image_ep_info(uint32_t type)
 {
 	entry_point_info_t *next_image_info;