clk: zynqmp: divider: Align max_div description with mainline

commit  0453778142489ec8d675bc417f900ce3e44b5fac from
https://github.com/Xilinx/linux-xlnx.git xlnx_rebase_v5.10

There is different description upstream added by commit 7db20bc1

 ("clk:
zynqmp: divider: Add missing description for 'max_div'") that's why sync
it.

Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
State: pending
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>