Populate ShutterMsg::readoutTimestamp

required by CTS

Bug: 294302146
Test: atest CtsCameraTestCases:ReadoutTimestampTest
Change-Id: Id86cccbdff4597a96f2a10fca9cdccb81740d147
Merged-In: Id86cccbdff4597a96f2a10fca9cdccb81740d147
Signed-off-by: Roman Kiryanov <rkir@google.com>
6 files changed