arm64: zynqmp: Add RC21008A clock nodes for vhk158

commit 297cb740274947e8d2807be5b35bbaad78432265 from
https://github.com/Xilinx/linux-xlnx.git

 xlnx_rebase_v5.15

Add RC21008A clock nodes and fclk bindings so clocks could be referenced
through sysfs interface.

Signed-off-by: Saeed Nowshadi <saeed.nowshadi@amd.com>
State: pending
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>