google/kukui: Use internal CR50_IRQ pull-up

For Kukui CR50_IRQ pin, we're going to replace external pull-up with
internal pull-up. This change won't break older boards, so we can just
always do that when setting up GPIOs.

BUG=b:124821269
BRANCH=none
TEST=Waveform looks correct.

Change-Id: Ib1a90dce583a6aa0cec8ac8ba96d1362f50c16a8
Signed-off-by: You-Cheng Syu <youcheng@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32116
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>

src/mainboard/google/kukui/chromeos.c

@@ -24,6 +24,7 @@ void setup_chromeos_gpios(void)
 {
 	gpio_input_pullup(EC_IN_RW);
 	gpio_input_pullup(EC_IRQ);
+	gpio_input_pullup(CR50_IRQ);
 	gpio_output(GPIO_RESET, 0);
 }