Revert "bluesleep: implement to support bluedroid"

This reverts commit 895c74651efcb58d100b4564c3c72629c0d0c7c6.
Revert "bluetooth: enable sleep only if chip supports"

This reverts commit 48330b01c209ba87296b063fef354e7854838cf6.
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

Signed-off-by: Haley Teng <hteng@nvidia.com>