package/batman-adv: enable B.A.T.M.A.N. V protocol by default

As upstream enables CONFIG_BATMAN_ADV_BATMAN_V option since
2018.2 by defaullt ([1]) honor this in buildroot and do
the same (and remove the legacy experimental comment accordingly -
although upstream docs still mention it as legacy, that's really an
oversight, the community considers it the go-to protocol for years now).

[1] https://git.open-mesh.org/batman-adv.git/blob/HEAD:/CHANGELOG.rst#l174

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/batman-adv/Config.in

@@ -27,11 +27,10 @@ config BR2_PACKAGE_BATMAN_ADV_NC
 	  https://www.open-mesh.org/projects/batman-adv/wiki/NetworkCoding
 
 config BR2_PACKAGE_BATMAN_ADV_BATMAN_V
-	bool "enable B.A.T.M.A.N. V protocol (experimental)"
+	bool "enable B.A.T.M.A.N. V protocol"
+	default y
 	help
 	  Enables B.A.T.M.A.N. V network protocol.
-	  This is the next-gen protocol and is experimental at this
-	  time.
 
 	  https://www.open-mesh.org/projects/batman-adv/wiki/BATMAN_V