Revert "sign_gsc_firmware: update generated file name"
Revert "sign_gsc_firmware: update generated file name"

This reverts commit bc2317695965bb92b8809d9c06327adedcb0653c.

The reason for revert is that the signer needs to know the generated
file name, and in case vboot reference alters the name the signer
remains unaware of the change and is still looking for the file named
@CHIP@...

Some other means of figuring out the file name will be required, let's
stick with the @CHIP@ prefix for now.

BRANCH=none
BUG=b:173049030
TEST=none

Change-Id: I23ea65314d49e86fc4edb015e89b6076f87a54dd
Signed-off-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2605238
Tested-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>
Tested-by: George Engelbrecht <c828e237e346dc3df684bcfc0b60e48b180f6a3d@google.com>
Auto-Submit: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>
Reviewed-by: George Engelbrecht <c828e237e346dc3df684bcfc0b60e48b180f6a3d@google.com>
Commit-Queue: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot