Bluetooth: Handle pairing Cancel intent.

Receive Pairing cancel intent and clear pairing request
from notification window.

CRs-fixed: 463362

Change-Id: I63c9299edca4356485f26cbc6332e3be9bdfbf17
(cherry picked from commit fc82c5a6a3e74aeba6139e0ccf48f634fd970e62)
(cherry picked from commit dc299471edd42a5b30c0f54ef8d33730e33d03a3)
(cherry picked from commit 32f973cbe79d2474d0815d7dd90c6960af120b3c)