lib/prog_loading: introduce prog_segment_loaded()

In order to not muddle arch vs chipset implementations provide
a generic prog_segment_loaded() which calls platform_segment_loaded()
and arch_segment_loaded() in that order. This allows the arch variants
to live in src/arch while the chipset/platform code can implement
their own.

Change-Id: I17b6497219ec904d92bd286f18c9ec96b2b7af25
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/14214
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Andrey Petrov <andrey.petrov@intel.com>

src/lib/selfboot.c

@@ -452,7 +452,7 @@ static int load_self_segments(
 			 * Each architecture can perform additonal operations
 			 * on the loaded segment
 			 */
-			arch_segment_loaded((uintptr_t)dest, ptr->s_memsz,
+			prog_segment_loaded((uintptr_t)dest, ptr->s_memsz,
 					last_non_empty == ptr ? SEG_FINAL : 0);
 		}
 	}