Introduce vendor stable aidl for wpa_supplicant

This commit introduces new vendor stable aidl for wpa_supplicant.

Adding supplicant vendor stable AIDL to allow doDriverCmd which is used
by System service module (QtiWifiService).
This was earlier done through HIDL interface.

Change-Id: I271994ab4be58976fe564ada887bccfbf3876be9
CRs-Fixed: 3196761
17 files changed