staging: clocking-wizard: Add support for dynamic reconfiguration

The patch adds support for dynamic reconfiguration of clock output rate.
Output clocks are registered as dividers and set rate callback function
is used for dynamic reconfiguration.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Co-developed-by: Chirag Parekh <chirag.parekh@xilinx.com>
Link: https://lore.kernel.org/r/1614172241-17326-6-git-send-email-shubhrajyoti.datta@xilinx.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>