mb/google/brya: Add variant GPIO override functions

Provide functions to allow for variants to override only a few pads from
the baseboard table.

BUG=b:189362981

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: I3ae6c11ca8614d523f3402f1c1abb7c82124e473
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55324
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>

src/mainboard/google/brya/mainboard.c

@@ -8,10 +8,13 @@
 
 static void mainboard_init(void *chip_info)
 {
-	const struct pad_config *pads;
-	size_t num;
-	pads = variant_gpio_table(&num);
-	gpio_configure_pads(pads, num);
+	const struct pad_config *base_pads;
+	const struct pad_config *override_pads;
+	size_t base_num, override_num;
+
+	base_pads = variant_gpio_table(&base_num);
+	override_pads = variant_gpio_override_table(&override_num);
+	gpio_configure_pads_with_override(base_pads, base_num, override_pads, override_num);
 }
 
 static void mainboard_dev_init(struct device *dev)

src/mainboard/google/brya/variants/baseboard/gpio.c

@@ -406,6 +406,12 @@ const struct pad_config *__weak variant_gpio_table(size_t *num)
 	return gpio_table;
 }
 
+const struct pad_config *__weak variant_gpio_override_table(size_t *num)
+{
+	*num = 0;
+	return NULL;
+}
+
 const struct pad_config *__weak variant_early_gpio_table(size_t *num)
 {
 	*num = ARRAY_SIZE(early_gpio_table);

src/mainboard/google/brya/variants/baseboard/include/baseboard/variants.h

@@ -12,6 +12,7 @@
  */
 
 const struct pad_config *variant_gpio_table(size_t *num);
+const struct pad_config *variant_gpio_override_table(size_t *num);
 const struct pad_config *variant_early_gpio_table(size_t *num);
 const struct cros_gpio *variant_cros_gpios(size_t *num);