prog_loader: Change legacy_romstage_select_and_load() to return cb_err

This is passing through a cb_err from cbfs_prog_stage_load(), so it
should be declared to return that as well.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I5510d05953fe8c0e2cb511f01f862b66ced154ae
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62656
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/program_loading.h

@@ -5,8 +5,7 @@
 #include <bootmem.h>
 #include <commonlib/bsd/cbfs_serialized.h>
 #include <commonlib/region.h>
-#include <stdint.h>
-#include <stddef.h>
+#include <types.h>
 
 enum {
 	/* Last segment of program. Can be used to take different actions for
@@ -139,7 +138,7 @@ void platform_prog_run(struct prog *prog);
 void run_romstage(void);
 
 /* Runtime selector for CBFS_PREFIX of romstage. */
-int legacy_romstage_select_and_load(struct prog *romstage);
+enum cb_err legacy_romstage_select_and_load(struct prog *romstage);
 
 /************************
  *   RAMSTAGE LOADING   *