vboot: Support servo micro and C2D2 for {get,set}_gbb_flags.sh --servo.

Detect servo micro and C2D2 servo types and toggle cpu_fw_spi before and
after flash access is required.

BUG=b:220992685
TEST={get,set}_gbb_flags.sh --servo with C2D2 and servo micro
BRANCH=None

Cq-Depend: chromium:3470605
Change-Id: I9f8a9bcabe731001ed18150ca1db9820db20e0d3
Signed-off-by: Sam McNally <sammc@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3469747
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
3 files changed