clk: zynqmp: Add support for CCF driver

Add support for CCF, this CCF reads the ref clocks
from dt and checks all the required clock control
registers for its source , divisors and calculates
the clock from them. This supports clock and set
functions.

Panic when read/write fails.
Signed-off-by: NSiva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>