bluetooth: unlock spin on bluesleep_stop before controling the hsuart power

Kernel migh be in sleep to wait for rpm communication when it controls
the
hsuart power. So should unlock the spin before controling the hsuart
power.

Change-Id: Ic051ee95df8be3e7dcea1bc71cba85bdbab34bef
Signed-off-by: Devin Kim <dojip.kim@lge.com>

Conflicts:
	drivers/bluetooth/bluesleep.c