UBUNTU: (config) Add NET_DSA=n

BugLink: http://bugs.launchpad.net/bugs/1732698

Stable commit "net: dsa: select NET_SWITCHDEV" now requires an
explicit setting.
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

debian.master/config/config.common.ubuntu

@@ -5081,6 +5081,7 @@ CONFIG_NET_CLS_U32=m
 CONFIG_NET_CORE=y
 CONFIG_NET_DCCPPROBE=m
 CONFIG_NET_DROP_MONITOR=m
+# CONFIG_NET_DSA is not set
 # CONFIG_NET_DSA_MV88E6XXX is not set
 # CONFIG_NET_DSA_MV88E6XXX_NEED_PPU is not set
 CONFIG_NET_EMATCH=y