arm64: defconfig: enable Rockchip RK3308 internal audio codec driver

This codec now has a driver.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Link: https://lore.kernel.org/r/20240305-rk3308-audio-codec-v4-5-312acdbe628f@bootlin.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>