staging: rtl8192u: Remove typedef phy_ofdm_rx_status_rxsc_sgien_exintfflag

Remove typdef phy_ofdm_rx_status_rxsc_sgien_exintfflag and replace its uses
in the code.

Signed-off-by: simran singhal <singhalsimran0@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>