clk: lan966x: Add lan966x SoC clock driver

This adds Generic Clock Controller driver for lan966x SoC.

Lan966x clock controller contains 3 PLLs - cpu_clk, ddr_clk
and sys_clk. It generates and supplies clock to various
peripherals within SoC.
Register settings required to provide GCK clocking to a
peripheral is as below:
GCK_SRC_SEL     = Select clock source.
GCK_PRESCALER   = Set divider value.
GCK_ENA         = 1 - Enable GCK clock.

Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
Co-developed-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20211103061935.25677-4-kavyasree.kotagiri@microchip.com

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