bluetooth: Enable HCI UART H4 driver

Enable HCI UART driver to allow bluetoothd to work; disable bluesleep
driver for now as it conflicts with the HCI driver when BT is used.

Signed-off-by: Hannu Mallat <hannu.mallat@jollamobile.com>
Merge pull request #2 from hmallat/hci-driver-config

bluetooth: Enable HCI UART H4 driver