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/memrange.c

@@ -47,7 +47,7 @@ static struct range_entry *alloc_range(struct memranges *ranges)
 		range_entry_unlink(&ranges->free_list, r);
 		return r;
 	}
-	if (ENV_RAMSTAGE)
+	if (ENV_PAYLOAD_LOADER)
 		return malloc(sizeof(struct range_entry));
 	return NULL;
 }