staging: r8188eu: remove unused function prototype

The function prototype rtl8188e_query_rx_phy_status() is not used.
Remove it.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220225120843.10674-3-straube.linux@gmail.com


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