Wifi: Add vendor hal 1.6 to rc and make files

This CL adds ver 1.6 in Android.bp and rc file. Those were missed
when the HAL version was uprev'd to 1.6

Bug: 214108561
Test: atest VtsHalWifiV1_0TargetTest VtsHalWifiNanV1_0TargetTest VtsHalWifiApV1_0TargetTest \
            VtsHalWifiV1_1TargetTest \
            VtsHalWifiV1_2TargetTest VtsHalWifiNanV1_2TargetTest \
            VtsHalWifiV1_3TargetTest \
            VtsHalWifiApV1_4TargetTest VtsHalWifiNanV1_4TargetTest VtsHalWifiRttV1_4TargetTest \
            VtsHalWifiV1_5TargetTest VtsHalWifiNanV1_5TargetTest VtsHalWifiApV1_5TargetTest
Change-Id: I5ce531b92af12b54b4a25548e6fef1198fb23716