staging: r8188eu: we only need one struct bb_reg_def for path a

The r8188eu driver does no longer access rf path b registers via
PHYRegDef.

Change the PHYRegDef array in struct hal_data_8188e to a single
variable that holds the register addresses for rf path a. Remove
the initialisation of path b register addresses.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220212161737.381841-11-martin@kaiser.cx


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