clk: microchip: Add driver for Microchip PolarFire SoC

Add support for clock configuration on Microchip PolarFire SoC

Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Co-developed-by: Padmarao Begari <padmarao.begari@microchip.com>
Signed-off-by: Padmarao Begari <padmarao.begari@microchip.com>
Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
Co-developed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20220222121143.3316880-2-conor.dooley@microchip.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>