Bluetooth: HID: Add support for Set Idle and Get Idle commands (1/4)

This patch adds the relevant callback prototyps for Set Idle and
Get Idle which is used for setting/getting idle time on HID devices.

Without this support TC_HOS_HID_BV_05/06 PTS test cases for HID 1.0
cannot be passed.

Change-Id: I4c528a510edd847bc6121ce0b875ae313f090b9c
CRs-Fixed: 522511
1 file changed