[dv] Fix clkmgr_cov_bind for lc_tx_t type ports
[dv] Fix clkmgr_cov_bind for lc_tx_t type ports

Signed-off-by: Weicai Yang <4fa8c7762ee4da95e3dee7dae2c3263ea16637f9@google.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan