arm64: dts: rockchip: Assign ES8316 MCLK rate on rk3588-rock-5b

The I2S0_8CH_MCLKOUT clock rate on Rock 5B board defaults to 12 MHz and
it is used to provide the master clock (MCLK) for the ES8316 audio
codec.

On sound card initialization, this limits the allowed sample rates
according to the MCLK/LRCK ratios supported by the codec, which results
in the following non-standard rates: 15625, 30000, 31250, 46875.

Hence, the very first access of the sound card fails:

  Broken configuration for playback: no configurations available: Invalid argument
  Setting of hwparams failed: Invalid argument

However, all subsequent attempts will succeed, as the audio graph card
will request a correct clock frequency, based on the stream sample rate
and the multiplication factor.

Assign MCLK to 12.288 MHz, which allows the codec to advertise most of
the standard sample rates.

Fixes: 55529fe ("arm64: dts: rockchip: Add rk3588-rock-5b analog audio")
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Link: https://lore.kernel.org/r/20230530181140.483936-4-cristian.ciocaltea@collabora.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: cristicc

arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts

@@ -133,6 +133,8 @@
 		reg = <0x11>;
 		clocks = <&cru I2S0_8CH_MCLKOUT>;
 		clock-names = "mclk";
+		assigned-clocks = <&cru I2S0_8CH_MCLKOUT>;
+		assigned-clock-rates = <12288000>;
 		#sound-dai-cells = <0>;
 
 		port {