IB/core: Align coding style of ib_device_cap_flags structure

Modify enum ib_device_cap_flags such that other patches which add new
enum values pass strict checkpatch.pl checks.

Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>