net: danipc: Receive only danipc protocol pkts from Linux

Set device attribute to not receive ARP protocol
packets, as danipc device is not really an ethernet
device. Without these changes danipc would receive
unexpected IPV6 multicast packets during device up.

Changes are made as protective measure to accept/process
only danipc packets (identified by danipc protocol)
from Linux. Packets from other Layer-3 protocol (IP etc)
are not supported in danipc.

Change-Id: I6bed639a3034f7638fb0b6879d727c1bfca95416
Acked-by: Vijayapal Akula <akulav@qti.qualcomm.com>
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>