util/amdfwtool: Support not passing recovery/backup APCB

If Recovery/Backup APCB is not passed, then AMD_BIOS_APCB_BK entry is
not populated. But PSP expects that bios directory entry to be
populated. Also on mainboards where both APCB and recovery APCB are same
(eg. Skyrim), 2 copies of the same APCB are added to amdfw*.rom. Update
amdfwtool to support not passing recovery/backup APCB. If the recovery
APCB is not passed, then populate AMD_BIOS_APCB_BK entry and make it
point to the same offset as AMD_BIOS_APCB entry.

BUG=b:240696002
TEST=Build and boot to OS in Skyrim. Ensure that the device can enter
recovery mode. Perform multiple suspend/resume cycles.

Change-Id: I031ba817573cd35160f5e219b1b373ddce69aa6b
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73661
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/amdfwtool/amdfwtool.h

@@ -405,6 +405,7 @@ typedef struct _amd_cb_config {
 	bool recovery_ab_single_copy;
 	bool need_ish;
 	bool use_combo;
+	bool have_apcb_bk;
 	enum platform soc_id;
 } amd_cb_config;