Always use named structs in header files

Add tag names to all unnamed structs in header files. This
allows forward declaration of structs, which is necessary to
reduce header file nesting (to be implemented in a subsequent
commit).

Also change the typedef names across the codebase to use the _t
suffix to be more conformant with the Linux coding style. The
coding style actually prefers us not to use typedefs at all but
this is considered a step too far for Trusted Firmware.

Also change the IO framework structs defintions to use typedef'd
structs to be consistent with the rest of the codebase.

Change-Id: I722b2c86fc0d92e4da3b15e5cab20373dd26786f
diff --git a/include/bl31/bl31.h b/include/bl31/bl31.h
index a5539d9..6dd7596 100644
--- a/include/bl31/bl31.h
+++ b/include/bl31/bl31.h
@@ -46,9 +46,9 @@
 extern void bl31_set_next_image_type(uint32_t type);
 extern uint32_t bl31_get_next_image_type(void);
 extern void bl31_prepare_next_image_entry();
-extern el_change_info *bl31_get_next_image_info(uint32_t type);
+extern el_change_info_t *bl31_get_next_image_info(uint32_t type);
 extern void bl31_platform_setup(void);
-extern meminfo *bl31_plat_get_bl32_mem_layout(void);
-extern meminfo *bl31_plat_sec_mem_layout(void);
-extern void bl31_register_bl32_init(int32_t (*)(meminfo *));
+extern meminfo_t *bl31_plat_get_bl32_mem_layout(void);
+extern meminfo_t *bl31_plat_sec_mem_layout(void);
+extern void bl31_register_bl32_init(int32_t (*)(meminfo_t *));
 #endif /* __BL31_H__ */