dt-bindings: xilinx: Add missing ids for PD

There are some new power domain IDs which are used in Linux kernel that's
why add them here too.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/e6092e1d3766c0ac11bf620820739c93ab677a85.1648626981.git.michal.simek@xilinx.com