drivers: sam: add at91_i2s_mux clock driver

Add driver for I2S mux clock.

Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-b

drivers: sam: add at91_i2s_mux clock driver

Add driver for I2S mux clock.

Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Clément Léger <clement.leger@bootlin.com>

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