[rdc/spid] Add Rx/Tx FIFO reset to CSR path waivers
[rdc/spid] Add Rx/Tx FIFO reset to CSR path waivers

Signed-off-by: Eli Kim <3ca62a2ad87376be2697209a1770e1afdbbba220@opentitan.org>

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