staging: rtl8188eu: Remove function rtw_hal_sreset_xmit_status_check()
rtw_hal_sreset_xmit_status_check() is a wrapper to call
rtl8188e_sreset_xmit_status_check(), which calls
rtl8188e_silentreset_for_specific_platform() in case of transmission has
stopped to do a silent reset and restore the transmission but
rtl8188e_silentreset_for_specific_platform() has empty defination,
so we can remove rtw_hal_sreset_xmit_status_check() because it doesn't
serve its purpose.