clk: zynqmp: Add support for dpll clock source

clk: zynqmp: Add support for dpll clock source

The clock driver fails to correctly calculate the PLL clock
rate for peripherals when using the DPLL as the clock source.
The DPLL operates within the full power domain, while peripheral
clocks reside in the low power domain. To ensure accurate PLL
clock rate computation when the peripheral clock source is set
to DPLL, the DPLL-to-LPD cross divisor is used.

Signed-off-by: Padmarao Begari <padmarao.begari@amd.com>
Link: https://lore.kernel.org/r/20250618094329.296731-1-padmarao.begari@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>