mb/google/volteer: Select SX9310 driver in Kconfig

There are SX9310 devices present in devicetree.cb but the driver is
not enabled so it is not getting used.

Change-Id: I625233013a2e14eaf758e56027774fbf5df3bc83
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41700
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/volteer/Kconfig

@@ -4,6 +4,7 @@ config BOARD_GOOGLE_BASEBOARD_VOLTEER
 	select DRIVERS_GENERIC_MAX98357A
 	select DRIVERS_I2C_GENERIC
 	select DRIVERS_I2C_HID
+	select DRIVERS_I2C_SX9310
 	select DRIVERS_INTEL_SOUNDWIRE
 	select DRIVERS_SPI_ACPI
 	select DRIVERS_SOUNDWIRE_ALC5682