cros_bundle_firmware: Handle hex numbers when decoding strings

In a future CL I'd like to specify an integer using the "0x" format.
Detect this and handle it by adding "base 0" to the integer
conversion.

BUG=chrome-os-partner:20172
TEST=Next CL doens't yell about 0x anymore when no pin is defined.

Change-Id: I98711b9b6b31f3d1a10da69ade3115be29b289b3
Reviewed-on: https://gerrit.chromium.org/gerrit/58876
Commit-Queue: Doug Anderson <dianders@chromium.org>
Tested-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
1 file changed