gpio: cleanup header usage for buttons

button.h only requires the enum gpio_signal, so use gpio_signal.h
instead of gpio.h.

The build compare doesn't match due to the ASSERT() call in
keyboard_vivaldi.c. The line number increases by 1, changing the assert
output text.

From vivaldi_init(), before the change:

    21a1            movs    r1, #161        ; 0xa1
    f7fe f856       bl      10099484 <panic_assert_fail>

After the change:

    21a2            movs    r1, #162        ; 0xa2
    f7fe f856       bl      10099484 <panic_assert_fail>

BUG=b:218856245
BRANCH=none
TEST=compare_build.sh

Signed-off-by: Keith Short <keithshort@chromium.org>
Change-Id: Ib0aae4e7b66dd9f83071095b7db233444f6dc4be
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3489092
Reviewed-by: Aaron Massey <aaronmassey@google.com>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Jeremy Bettis <jbettis@chromium.org>
Reviewed-by: Yuval Peress <peress@google.com>

0 files changed, 0 insertions, 0 deletions