bluesleep: implement to support bluedroid

"#define BT_BLUEDROID_SUPPORT 1" -> support BlueDroid
"#define BT_BLUEDROID_SUPPORT 0" -> support BlueZ

Since BlueDroid does not use kernel space HCI driver now, we add the
below 2 /proc nodes to make BlueDroid able to send HCI events to
bluesleep driver.

write 1 to /proc/bluetooth/sleep/lpm -> equivalent to HCI_DEV_REG event
write 0 to /proc/bluetooth/sleep/lpm -> equivalent to HCI_DEV_UNREG event
write 1 to /proc/bluetooth/sleep/btwrite -> equivalent to HCI_DEV_WRITE event

Change-Id: I2ffd06e737371883e1b0a033b5cf205ba3046396
Signed-off-by: Haley Teng <hteng@nvidia.com>
[P350] Register bluesleep uart for bluedroid

Change-Id: I01c9d99349cc14133e43e1fd172c5f22489ca26e