staging: vt6655: dpc.c/h remove dead functions

s_byGetRateIdx
s_vGetDASA
s_vProcessRxMACHeader
s_bAPModeRxCtl
s_bAPModeRxData
s_bHandleRxEncryption
s_bHostWepRxEncryption
s_vProcessRxMACHeader
s_byGetRateIdx
s_vGetDASA
device_receive_frame
s_bAPModeRxCtl

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