Camera2: Factor out Camera2Client::Parameters

Move the parameter structure and the various utility methods using it
to its own class. Rename LockedParameters to SharedParameters to match
the Mutex naming convention.

Also move CameraMetadata to camera2 directory for organization.

No functional changes.

Bug: 6243944
Change-Id: Ie60b535936ecfda9bf23361d52604abf515c83d0
diff --git a/services/camera/libcameraservice/Camera2Device.cpp b/services/camera/libcameraservice/Camera2Device.cpp
index 35c4e74..7cac025 100644
--- a/services/camera/libcameraservice/Camera2Device.cpp
+++ b/services/camera/libcameraservice/Camera2Device.cpp
@@ -156,7 +156,7 @@
     return res;
 }
 
-const CameraMetadata& Camera2Device::info() const {
+const camera2::CameraMetadata& Camera2Device::info() const {
     ALOGVV("%s: E", __FUNCTION__);
 
     return mDeviceInfo;