staging: vt6656: rxtx.c s_vFillRTSHead Parse out struct vnt_rts_ab to new function.

Parse out vnt_rts_ab code to new function vnt_rxtx_rts_ab_head.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>