Bluetooth: HCI: Fix using nano_delayed_work API

This fixes warnings related to the use of nano_work and
nano_delayed_work in HCI layer.

Note that k_delayed_work takes a timeout in miliseconds rather than in
ticks thus the timeout values have been changed.

Change-Id: I953a82a6aa613bb1072a8ad4b01e0f94e5cd64bd
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>