staging: wilc1000: replaces memcmp with ether_addr_equal_unaligned

This patch replaces memcmp with ether_addr_equal_unaligned.
Warning reported by checkpatch.pl
 - Prefer ether_addr_equal() or ether_addr_equal_unaligned() over memcmp()

Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>