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/include/acpi/acpi_device.h

@@ -313,6 +313,9 @@ struct acpi_i2c {
 /* Write I2cSerialBus() descriptor to SSDT AML output */
 void acpi_device_write_i2c(const struct acpi_i2c *i2c);
 
+/* Write GPIO descriptor of DSD property */
+int acpi_device_write_dsd_gpio(struct acpi_gpio *gpio, int *curr_index);
+
 /*
  * ACPI SPI Bus
  */