IBMLANA no longer has to depend on MCA_LEGACY

This patch removes the no longer required dependency of IBMLANA
on MCA_LEGACY.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>