ryu: Get bootloader version string using get_active_firmware_id

We need bootloader version string to be constantly increasing for
automated flashing and testing purpose. Use newly added
get_active_firmware_id to extract id from fmap and provide to fastboot
call.

BUG=chrome-os-partner:35861
BRANCH=None
TEST=fastboot getvar version-bootloader reports correct version string.

Change-Id: I7d7fbd0e8615036441782a157636b0ec3012f781
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://chromium-review.googlesource.com/251475
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Trybot-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
1 file changed