nimble/ll: Rename BLE_DEVICE to BLE_CONTROLLER
nimble/ll: Rename BLE_DEVICE to BLE_CONTROLLER

BLE_CONTROLLER better describes the function of this syscfg setting and
fits better with BLE_HOST.

Also BLE_LP_CLOCK is redundant.

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble