Replace ENV_RAMSTAGE with ENV_PAYLOAD_LOADER

This patch relying on new rule, ENV_PAYLOAD_LOADER which is set
to ENV_RAMSTAGE.

This approach will help to add future optimization (rampayload) in
coreboot flow if required.

Change-Id: Ib54ece7b9e5f281f8a092dc6f38c07406edfa5fa
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32725
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: ron minnich <rminnich@gmail.com>

src/lib/prog_loaders.c

@@ -160,7 +160,7 @@ fail:
 	die_with_post_code(POST_INVALID_ROM, "Ramstage was not loaded!\n");
 }
 
-#ifdef __RAMSTAGE__ // gc-sections should take care of this
+#if ENV_PAYLOAD_LOADER // gc-sections should take care of this
 
 static struct prog global_payload =
 	PROG_INIT(PROG_PAYLOAD, CONFIG_CBFS_PREFIX "/payload");