OPP: Prevent ANR during file share

Use case:
1) prepare 199 files to send via Bluetooth,
2) when go to the Bluetooth selecting device page,
   do not select a device, go back home.
3) try to send the files again.
4) reproduce 1 to 3 multiple times.

Error:
ANR in com.android.bluetooth

Root cause:
Before opening device picker activity, user sharing another batch
of files multiple times which is causing dead lock.

Fix:
Share another batch of files only when previous shared
files info was updated in OPP DB  or cleared from
local variables to avoid ANR in profile.

Crs-Fixed: 2342199
Change-Id: I852af44b6a66565be0b17dc8648c724d2af6aa3f
4 files changed