MAP: Add support for Connection ID

This patch adds support for connection identifier used while
sending put requests to MNS.

Change-Id: I016940d2ca023fc7d2e3da1c63e338e1528be147
CRs-Fixed: 518395
Bluetooth: HID: Add support for Set Idle and Get Idle Commands

This patch provides an interface for application to send Set Idle
and Get Idle commands to remote HID Device. Support for these
two commands was missing from exisitng code, so existing code
design is reused to add support for these two commands.

Change-Id: I548362cc328498920b2dae740f1a76b2cc2d6a67
CRs-Fixed: 522511