Bluetooth: Enable bluetooth before binding the pxp proxy service

This change delays the binding of the pxp proxy service and confirms
that bluetooth is enabled before doing that.
This prevents the bluetooth crash at device reboot if pxp app tries
to enable bluetooth.

Change-Id: Iac63863a43afc1015219b6ad96959fe561acf228
CRs-Fixed: 641293
1 file changed