payloads/edk2/Makefile: Improve dirty repo check, sync submodules

Don't skip checking out the specified edk2 branch if the repo contains
untracked files, which may be the case if the EDK2_GOP_DRIVER option
is selected. Also ensure the submodule pointers are correct when
checking out.

TEST=build google/panther with GOP driver option and edk2 payload 2x,
switching branches between builds and ensure the correct branch is
used each time and submodules are synced with branch.

Change-Id: If7040bd5c49209b37a4b308485bf59352197d3b6
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78030
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>

0 files changed, 0 insertions, 0 deletions