Update of BT power up sequences to remove redundant delay (500ms) in …

…BT_POWER operation during HCIDrive initialization.

Current BT_POWER sequence:
1. BT_POWER=0  ( from CyH4TransportDriver::initialize)
2. delay 1ms   ( from CyH4TransportDriver::initialize)
3. BT_POWER=1  ( from CyH4TransportDriver::initialize)
4. delay 500ms (from HCIDriver::do_initialize)
5. BT_POWER=1  (from HCIDriver::do_initialize)
6. delay 500ms (from HCIDriver::do_initialize)

updates:
1. remove 4) and 5)
2. keep all BT_POWER operations in one place. The best logic place is CyH4TransportDriver::initialize.

So finally the BT_POWER sequences should looks like:
1. BT_POWER=0  ( from CyH4TransportDriver::initialize)
2. delay 1ms   ( from CyH4TransportDriver::initialize)
3. BT_POWER=1  ( from CyH4TransportDriver::initialize)
4. delay 500ms ( from CyH4TransportDriver::initialize)