staging: vt6656: rxtx.c s_vFillRTSHead Parse out struct vnt_rts_g to new functions.

Parse out vnt_rts_g code to new function vnt_rxtx_rts_g_head.

Also create a new common calling function vnt_fill_ieee80211_rts
to fill the ieee80211_rts structure.

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