staging:rtl8192u: remove typedef from struct rx_drvinfo_819x_usb

Removed the typedef from the struct rx_drvinfo_819x_usb  to leave it as a
simple structure.

This clears the issue flagged by checkpatch, defining new types.

Signed-off-by: John Whitmore <johnfwhitmore@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>