drivers/soc/stoneyridge: Clean up unused gpio code

Dead code now that cr50_irq_status is using the kern gpio driver.

BUG=b:72838769
BRANCH=none
TEST=build for grunt

Change-Id: Ibb4018799732526942d0c3b05a3798e43ea6a9a3
Signed-off-by: Chris Ching <chingcodes@google.com>
Reviewed-on: https://chromium-review.googlesource.com/912361
Commit-Ready: Martin Roth <martinroth@chromium.org>
Tested-by: Martin Roth <martinroth@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
2 files changed