staging: r8188eu: remove SetHwReg8188EU()

Remove the case HW_VAR_CORRECT_TSF from SetHwReg8188EU() and move the
functionality to the function that calls SetHwReg8188EU() with
HW_VAR_CORRECT_TSF. SetHwReg8188EU() is empty now and we can finally
remove it.

Tested-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220715062908.8547-6-straube.linux@gmail.com


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