get_firmware_version: Update regex pattern for Intel's WiFi firmware version.

BUG=None
TEST=Used pythex.org to confirm correct regex pattern

Change-Id: I34c5fb54b3b80953029a8fde126992588ba9989b
Reviewed-on: https://chromium-review.googlesource.com/321451
Commit-Ready: Tien Chang <tienchang@chromium.org>
Tested-by: Tien Chang <tienchang@chromium.org>
Reviewed-by: Bindu Mahadev <bmahadev@chromium.org>
1 file changed