staging: vt6656: replace IS_ETH_ADDRESS_EQUAL with compare_ether_addr

Code cleanup, removed custom macro to compare Ethernet addresses.
Some checkpatch warnings on indentation were not resolved.

The return value of compare_ether_addr was reversed, something to consider.

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