rtl8xxxu: Report media status using the correct H2C command for 8723bu

Implement support for nextgen devices reporting connectition to the
firmware.

The H2C API for reporting connection to the firmware is different
between the two device generations. Use the fileops structure to
determine which one to call.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>