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/bl31/aarch64/runtime_exceptions.S b/bl31/aarch64/runtime_exceptions.S
index 7e119c5..e3673f0 100644
--- a/bl31/aarch64/runtime_exceptions.S
+++ b/bl31/aarch64/runtime_exceptions.S
@@ -84,7 +84,7 @@
 	 * interrupt controller reports a spurious interrupt then
 	 * return to where we came from.
 	 */
-	bl	ic_get_pending_interrupt_type
+	bl	plat_ic_get_pending_interrupt_type
 	cmp	x0, #INTR_TYPE_INVAL
 	b.eq	interrupt_exit_\label
 
@@ -105,7 +105,7 @@
 	 * Read the id of the highest priority pending interrupt. If
 	 * no interrupt is asserted then return to where we came from.
 	 */
-	bl	ic_get_pending_interrupt_id
+	bl	plat_ic_get_pending_interrupt_id
 	cmp	x0, #INTR_ID_UNAVAILABLE
 	b.eq	interrupt_exit_\label
 #endif