selfboot: use bootmem infrastructure

Instead of packing and unpacking entries in lb_mem use
the bootmem infrastructure for performing sanity checks
during payload loading.

Change-Id: Ica2bee7ebb0f6bf9ded31deac8cb700aa387bc7a
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/5303
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

src/include/payload_loader.h

@@ -58,7 +58,6 @@ struct payload_loader_ops {
 };
 
 /* Defined in src/lib/selfboot.c */
-struct lb_memory;
-void *selfload(struct lb_memory *mem, struct payload *payload);
+void *selfload(struct payload *payload);
 
 #endif  /* PAYLOAD_LOADER_H */