amdfwtool: Add flag for multi FW level to the struct amd_cb_config

This change can make the code be more flexible. And later we will use
amd_cb_config to transfer parameters.

Change-Id: Ic726aa9fc5f67803210af71d3e9cf2438b7e2a9b
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57062
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/amdfwtool/amdfwtool.h

@@ -224,6 +224,7 @@ typedef struct _amd_cb_config {
 	uint8_t unlock_secure;
 	uint8_t use_secureos;
 	uint8_t load_mp2_fw;
+	uint8_t multi_level;
 	uint8_t s0i3;
 } amd_cb_config;