WIFI: Add API to run driver command from priviledged apps

Adds a new API doDriverCmd in wifiManager and creates
AIDL interface for the same. This Api will allow privileged
apps (system/platform) to execute driver commands.

Change-Id: I7a457754a87a2875f2ed3ecca03ef0b023424c3e
CRs-Fixed: 2628721
2 files changed