Bluetooth: hci_qca: Add qcom devcoredump sysfs support

This patch implements the hci_qca driver side .coredump() callback to
trigger a devcoredump via sysfs.

Signed-off-by: Sai Teja Aluvala <quic_saluvala@quicinc.com>

v2 -> V3:
--------
Updated commit text

v1 -> V2:
--------
Updated to work with the updated HCI devcoredump API.

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