dts: versal_net: add secondary core clocks

commit c0f0e6635b5c46d10d1d031ec83cf181f4078395 from
https://github.com/Xilinx/linux-xlnx.git

 xlnx_rebase_v6.1

CCF clocks required for secondary cores for frequency scaling. So add
secondary cpu clocks.

Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@amd.com>
State: pending
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>