staging: rtl8723bs: hal: Change return type to void from u8

The function HalQueryTxOQTBufferStatus8723BSdio always returns true and
caller functions are not bother about return status.

Change return type to void.

Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>