tests: net: vlan: Increase stack size for header reserve test

Increasing the stack size for header_reserved test.
This avoids stack overflow in various boards.

Fixes #84620

Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>

Author: jukkar

tests/net/vlan/testcase.yaml

@@ -11,6 +11,7 @@ tests:
   net.vlan.header_reserved:
     extra_configs:
       - CONFIG_NET_L2_ETHERNET_RESERVE_HEADER=y
+      - CONFIG_TEST_EXTRA_STACK_SIZE=1024
   net.vlan.header_reserved.variable_size:
     extra_configs:
       - CONFIG_NET_L2_ETHERNET_RESERVE_HEADER=y