Move non-access methods to checkOp

ClipboardService previously used noteOp for all clipboard operations,
but this leads to the data being polluted by non-access methods like
getClipDescription and hasPrimaryClip. Move those methods to checkOps
instead.

This also moves the app op check to the end to avoid logging in
scenarios we would have rejected access anyways.

Fixes: 160791050
Test: atest ClipboardManagerTest
Change-Id: Ibb9299f918fcb5ef406f35405769099d179bdcd3