staging: r8188eu: remove rtw_hw_resume

Commit c0a099b7 ("staging: r8188eu: bHWPwrPindetect is always false")
removed the only call to rtw_hw_resume.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210918135722.23976-2-martin@kaiser.cx


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