firmware: Add static keyword to power_button_state

Since power_button_state is only used within vboot_ui.c, it should be
declared static.

BRANCH=none
BUG=none
TEST=emerge-nami vboot_reference

Change-Id: I392f137af15b36cf343817c681b18434e33e53e4
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1937048
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Joel Kitching <kitching@chromium.org>
1 file changed