staging: vt6656: removed custom definitions of Ethernet packet types

Removed some unused definitions of Ethernet packet types, also replaced
two of them with in-kernel counterparts from include/linux/if_ether.h

Signed-off-by: Andres More <more.andres@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --cc drivers/staging/vt6656/dpc.c
Simple merge

diff --cc drivers/staging/vt6656/rxtx.c
Simple merge

diff --cc drivers/staging/vt6656/tether.h
Simple merge