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/cbfs.c

@@ -206,7 +206,7 @@ int cbfs_prog_stage_load(struct prog *pstage)
 	/* Clear area not covered by file. */
 	memset(&load[fsize], 0, stage.memlen - fsize);
 
-	arch_segment_loaded((uintptr_t)load, stage.memlen, SEG_FINAL);
+	prog_segment_loaded((uintptr_t)load, stage.memlen, SEG_FINAL);
 
 out:
 	prog_set_area(pstage, load, stage.memlen);