amdfwtool: Take a config file instead of command line parameters

To verify the consistency, see if timeless builds with and without
this patch result in identical coreboot.rom files.

BUG=b:154032833
TEST=Build & boot on mandolin

Change-Id: Icae73d0730106aab687486e555ba947796e5e757
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42859
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nikolai Vyssotski <nikolai.vyssotski@amd.corp-partner.google.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

util/amdfwtool/Makefile

@@ -2,7 +2,7 @@
 
 HOSTCC ?= cc
 
-SRC = amdfwtool.c
+SRC = amdfwtool.c data_parse.c
 OBJ = $(SRC:%.c=%.o)
 TARGET = amdfwtool
 CFLAGS=-O2 -Wall -Wextra -Wshadow