Allow WiFi module to request grants from KeyChain

Bug: 160457441
Test: atest MixedDeviceOwnerTest#testAddNetworkWithKeychainKey_granted
Test: atest MixedDeviceOwnerTest#testAddNetworkWithKeychainKey_notGranted
Test: atest MixedManagedProfileOwnerTest#testAddNetworkWithKeychainKey_granted
Change-Id: I89d753f9000ef2616ffbe3df11c003ac54ddee26
3 files changed