drivers: sam: add at91_main clock driver

Add driver for main clock.

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

drivers: sam: add at91_main clock driver

Add driver for main clock.

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

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