staging: r8188eu: remove path parameter from phy_RFSerialRead

All callers of phy_RFSerialRead set 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/20220212161737.381841-10-martin@kaiser.cx


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