Stops a running camera stream properly

This change adds a logic to stop a running camera stream properly
when VirtualCamera object is being destroyed.

Bug: 129154621
Test: Build and validated on Hawk
Change-Id: Id583fc5911660b80f1a0d7daedb18c9f0e520b91
Signed-off-by: Changyeon Jo <changyeon@google.com>
(cherry picked from commit 52082174a7f07546eae1d2e1da3214ab7364f657)
1 file changed