stm32: add meowth_fp board

Configure it as a fingerprint MCU.

Currently use ZerbleBarn as a proxy for it.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=none
BUG=b:67081508
TEST=flash and run the image on ZerbleBarn,
do a finger image acquisition with the 'fptest' console command.

Change-Id: I6e060c2d1e950ec81092088e1793b186fc0a5fa0
Reviewed-on: https://chromium-review.googlesource.com/806169
Commit-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Shawn N <shawnn@chromium.org>
6 files changed