acpi: Make acpi_device_write_dsd_gpio() public

Make sure it can be used for other driver.
At present, i2c_generic_write_gpio() is not suitable for being called
by other drivers, so delete it, add acpi_device_write_dsd_gpio() to
replace it, and make it public.

BUG=None
TEST= Build BIOS FW pass and it can be use for other driver.

Change-Id: Ifb2e60690711b39743afd455c6776c5ace863378
Signed-off-by: Jianeng Ceng <cengjianeng@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81788
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <ericllai@google.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>

src/acpi/device.c

@@ -39,6 +39,23 @@
 #define ACPI_DSD_STORAGE_D3_UUID "5025030F-842F-4AB4-A561-99A5189762D0"
 #define ACPI_DSD_STORAGE_D3_NAME "StorageD3Enable"
 
+/* Write GPIO descriptor of DSD property */
+int acpi_device_write_dsd_gpio(struct acpi_gpio *gpio, int *curr_index)
+{
+	int ret = -1;
+
+	if (!gpio || !curr_index)
+		return ret;
+
+	if (gpio->pin_count == 0)
+		return ret;
+
+	acpi_device_write_gpio(gpio);
+	ret = *curr_index++;
+
+	return ret;
+}
+
 /* Write empty word value and return pointer to it */
 static void *acpi_device_write_zero_len(void)
 {