arm64: zynqmp: Add dmas, gpu, rtc, watchdogs and opp nodes for SOM

There are couple of IPs which are enabled in origin HW design which are
missing in SOM dt. Add them to match default setup.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/901401beacbea5931fc18cde20c157e5978a7023.1652262769.git.michal.simek@amd.com