Revert "Upgrade targetSDK, minSDK and support libraries"

This reverts commit 70fa1803a62eb00de2ae441a02cdfad5b847969c.

Enable launching the camera app on Android 9 by (temporarily) reverting
the commit for upgrading the targetSdkVersion.

Issue: FP2P-322
Change-Id: Ic381dabbfab7a72603af9e3f7593d5d70d1deac4
6 files changed