staging: r8188eu: remove path parameter from phy_RFSerialWrite

The only caller of phy_RFSerialWrite sets the eRFPath parameter
to RF_PATH_A. Remove the parameter and use RF_PATH_A directly.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220212161737.381841-5-martin@kaiser.cx


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>