arm64: zynqmp: add ref_clk property for REFCLKPER calculation

commit 053862ebb7706c624f394228d7b721e5bc199e22 from
https://github.com/Xilinx/linux-xlnx.git

 xlnx_rebase_v5.15

Added ref_clk 'ref' property for GUCTL_REFCLKPER and GFLADJ_REFCLK_FLADJ
calculation. This property configure correct value for SOF/ITP counter
and period of ref_clk.
This patch adds 'ref' property for both dwc3_0 and dwc3_1 cores.

Signed-off-by: Piyush Mehta <piyush.mehta@amd.com>
State: pending
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>