staging: r8188eu: clean up _PHY_PathADDAOn

The only caller sets isPathAOn = true and is2t = false. Remove the
parameters and resulting dead code.

Make the function static, it's used only inside HalPhyRf_8188e.c.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211107143100.9047-5-martin@kaiser.cx


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