dt-bindings: clock: add Intel Agilex5 clock manager

Add clock ID definitions for Intel Agilex5 SoCFPGA.
The registers in Agilex5 handling the clock is named as clock manager.

Signed-off-by: Teh Wen Ping <wen.ping.teh@intel.com>
Reviewed-by: Dinh Nguyen <dinguyen@kernel.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Niravkumar L Rabara <niravkumar.l.rabara@intel.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>