Move ScopedCap to libartbase.

artd also needs it.

Bug: 229268202
Test: m
Change-Id: Id4c16d119dcdb2751e1418a495608137555cca02
Merged-In: Id4c16d119dcdb2751e1418a495608137555cca02
(cherry picked from commit 9a187ad18c68b960a4882d4eee49e41c99eb519c)
3 files changed