xilinx: versal: board: use CONFIG_COUNTER_FREQUENCY

Since versal has CONFIG_COUNTER_FREQUENCY, so use it. And
COUNTER_FREQUENCY will be dropped.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Michal Simek <michal.simek@xilinx.com>
1 file changed