soc/amd/common/block: Fix guards for PSP transfer buffer
The transfer buffer is only required when using
VBOOT_STARTS_BEFORE_BOOTBLOCK.
The VBOOT workbuffer is only required when VBOOT_STARTS_BEFORE_BOOTBLOCK
or VBOOT_STARTS_IN_BOOTBLOCK.
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I444bede3f2b716e1900e7621453351d7fddadaa3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50403
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>