cxgb4vf: Prefix adapter flags with CXGB4VF

Some of these macros were conflicting with global namespace,
hence prefixing them with CXGB4VF.

Signed-off-by: Arjun Vynipadath <arjun@chelsio.com>
Signed-off-by: Vishal Kulkarni <vishal@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>