tests: net: socket: af_packet: Increase IPv4 context instance count

Test suite prints a warning on boot about not enough IPv4 context
instances compared to the number of interfaces, therefore adjust the
config value to get rid of it.

Signed-off-by: Robert Lubos <[email protected]>

Author: rlubos

tests/net/socket/af_packet/prj.conf

@@ -21,5 +21,6 @@ CONFIG_NET_LOG=y
 CONFIG_TEST_USERSPACE=y
 CONFIG_NET_MAX_CONTEXTS=8
 CONFIG_NET_MAX_CONN=8
+CONFIG_NET_IF_MAX_IPV4_COUNT=2
 
 CONFIG_MAIN_STACK_SIZE=1024