clk: at91: sam9x60-pll: add support for core clock frequency inputs

clk: at91: sam9x60-pll: add support for core clock frequency inputs

Add support for different core clock frequency input ranges
for different PLL IDs in the PLL driver and align sam9x60, sama7g5 SOC
platforms.

Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com>