Bluetooth: Allocate struct inquiry_entry with GFP_KERNEL

The allocation of inquiry cache entries is triggered as a result of
processing HCI events. Since the processing is done in the context
of a workqueue, there is no needed to allocate with GFP_ATOMIC in
that case. Switch it to GFP_KERNEL.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>