board-msm7x30: bt: Cleanup not proper when BT chip not detected

As apart of BT power on even if bluetooth chip is not detected,
bluetooth power on sequence is going ahead which is causing a
kernel panic.

Change-Id: I3c7fca7ade32bb958d3c67d7a25dd71d938fff5d
Signed-off-by: Ram Mohan Korukonda <rkorukon@codeaurora.org>