dt-bindings: xilinx: Remove Rajan, Jolly and Manish

Rajan, Jolly and Manish are no longer work for AMD/Xilinx and there is no
activity from them to continue to maintain bindings that's why remove them.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/9b252dd71c82593fa6b137eca2174d9ab6e57f7a.1684828606.git.michal.simek@amd.com