IB/core: Shifting initialization of device->cache_lock

IB/core: Shifting initialization of device->cache_lock

The lock cache_lock of struct ib_device is initialized in function
ib_cache_setup_one(). This is much later than the device initialization in
_ib_alloc_device().

This change shifts initialization of cache_lock in _ib_alloc_device().

Link: https://lore.kernel.org/r/20210712122625.1147-3-anand.a.khoje@oracle.com
Suggested-by: Haakon Bugge <haakon.bugge@oracle.com>
Signed-off-by: Anand Khoje <anand.a.khoje@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>