sw: Align polarity and phase for Rx and Tx

Align polarity and phase for SPI_OCORES_CTRL_Tx_NEG and SPI_OCORES_CTRL_Rx_NEG
with check for SPI_CPHA and mode(CPOL).

Signed-off-by: Mamta Shukla <mamta.ramendra.shukla@cern.ch>