write_firmware: Unify EnableUsbProgramming a bit more

We always want to warm_reset a board when we boot from A-A, regardless
of the SoC... so let's put that part into EnableUsbProgramming.

BUG=None
TEST=Confirm A-A boot still works on Nyan, Snow and Pit

Change-Id: I2bd2bb6de8630701bdc390b28779700e87721c40
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/177840
Reviewed-by: Simon Glass <sjg@chromium.org>
1 file changed