Fix some violations to MISRA rule 8.3

Wherever we use 'struct foo' and 'foo_t' interchangeably in a
function's declaration and definition, use 'struct foo' consistently
for both, as per the TF-A coding guidelines [1].

[1] https://github.com/ARM-software/arm-trusted-firmware/wiki/ARM-Trusted-Firmware-Coding-Guidelines#avoid-anonymous-typedefs-of-structsenums-in-header-files

Change-Id: I7998eb24a26746e87e9b6425529926406745b721
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
diff --git a/plat/arm/common/arm_bl31_setup.c b/plat/arm/common/arm_bl31_setup.c
index 6346f0f..b1f95c9 100644
--- a/plat/arm/common/arm_bl31_setup.c
+++ b/plat/arm/common/arm_bl31_setup.c
@@ -44,7 +44,7 @@
  * while BL32 corresponds to the secure image type. A NULL pointer is returned
  * if the image does not exist.
  ******************************************************************************/
-entry_point_info_t *bl31_plat_get_next_image_ep_info(uint32_t type)
+struct entry_point_info *bl31_plat_get_next_image_ep_info(uint32_t type)
 {
 	entry_point_info_t *next_image_info;