faudio: add I2S samesrc channel mapping to spdif [1/1]

PD#SWPL-6147

Problem:
I2S has 8 channels but spdif only 2.
Need map every single i2s lane to spdif sharebuffer.

Solution:
Add the DTS setting MASKS as former does.

Verify:
Local tested.

Change-Id: If212fc1b9c937a42778682948773874951b8a55a
Signed-off-by: Shuai Li <shuai.li@amlogic.com>

Conflicts:
	sound/soc/amlogic/auge/tdm.c
8 files changed