uprev_firmware.sh: use x86 naming convention

Use the same x86 naming convention for the board name with the 1st letter
being uppercased in the ebuild file.

Also adding support for PD firmware (when applicable).

BUG=None
TEST=./uprev_firmware.sh -b relm -v 7287.346.0
     ./uprev_firmware.sh -b asuka -v 7820.296.0

Change-Id: I0a85ebff8e3fb66fa8b556be5275f1edbf4d1f8a
Reviewed-on: https://chromium-review.googlesource.com/486100
Commit-Ready: YH Lin <yueherngl@chromium.org>
Tested-by: YH Lin <yueherngl@chromium.org>
Reviewed-by: Philip Chen <philipchen@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed