MLK-15340-4: ARM64: dts: support SPDIF, MQS, SAI in imx8qm

Add two new dts for spdif and mqs, which are supported by
imx8qm validation board with debug base board. The spdif and
mqs use same output pin.

The connection in debug base board is:
WM8962:
	CODEC_PWR_EN :   SEAF_B_B7
	CODEC_I2C_CLK:   SEAF_B_J32
	CODEC_I2C_DAT:   SEAF_B_J31
	AUD_MCLK  :      SEAF_B_H24
	AUD_TXC   :      SEAF_B_B35
	AUD_TXFS  :      SEAF_B_B36
	AUD_TXD   :      SEAF_B_B37
	AUD_RXD   :      SEAF_B_A36
	HEADPHONE_DET:   SEAF_B_A4
	MICROPHONE_DET:  SEAF_B_C4
	SEAF_B_G46:  GND
SPDIF:
	SPDIF_OUT:   SEAF_B_G39
	SPDIF_RX:    SEAF_B_G38
MQS:
	MQS_LEFT:     SEAF_B_G39
	MQS_RIGHT:    SEAF_B_G38

Signed-off-by: Shengjiu Wang <shengjiu.wang@freescale.com>
Reviewed-by: Mihai Serban <mihai.serban@nxp.com>