clearfog: Fix kernel mvneta configuration

I think that "buffer management" is probably a good thing to have, and
while I'm at it, let's also remove that other unused driver.

Change-Id: I0a9d91b3dc18738df395a0572f209c1943b7289a
diff --git a/board/czechlight/clearfog/linux.fragment b/board/czechlight/clearfog/linux.fragment
index 1f60709..1ea804e 100644
--- a/board/czechlight/clearfog/linux.fragment
+++ b/board/czechlight/clearfog/linux.fragment
@@ -1,6 +1,10 @@
 # this is a part of the Clearfog Base carrier
 CONFIG_SENSORS_MCP3021=y
 
+# mvneta
+CONFIG_MVNETA_BM_ENABLE=y
+CONFIG_MVPP2=n
+
 # PMBus for the PSUs
 CONFIG_PMBUS=y
 CONFIG_SENSORS_PMBUS=y