ASoC: mchp,i2s-mcc: Add SAMA7G5 to binding

SAMA7G5 includes an updated version of the I2S-MCC driver, that includes
3 more DIN/DOUT pin pairs for multi-channel.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Link: https://lore.kernel.org/r/20210301170905.835091-2-codrin.ciubotariu@microchip.com


Signed-off-by: Mark Brown <broonie@kernel.org>