payload loading: remove passing of struct payload

There's no need to keep track of struct payload within
the boot state machine. It is completely contained within
the payload loader module.

Change-Id: I16fcecf43d7fb41fc311955fdb82eabbd5c96b11
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/8836
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/lib/hardwaremain.c

@@ -227,26 +227,16 @@ static boot_state_t bs_write_tables(void *arg)
 
 static boot_state_t bs_payload_load(void *arg)
 {
-	struct payload *payload;
-
 	timestamp_add_now(TS_LOAD_PAYLOAD);
 
-	payload = payload_load();
-
-	if (! payload)
-		die("Could not load payload\n");
-
-	/* Pass the payload to the next state. */
-	boot_states[BS_PAYLOAD_BOOT].arg = payload;
+	payload_load();
 
 	return BS_PAYLOAD_BOOT;
 }
 
 static boot_state_t bs_payload_boot(void *arg)
 {
-	struct payload *payload = arg;
-
-	payload_run(payload);
+	payload_run();
 
 	printk(BIOS_EMERG, "Boot failed");
 	/* Returning from this state will fail because the following signals