android: Replace ThreadRPC with blocking method call

Use the newly introduced InvocationTypeBlocking message type to replace
the blocking message delivery implemented with the ThreadRPC class in the
Android camera HAL.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/android/camera_proxy.h

@@ -14,7 +14,6 @@
 #include <libcamera/camera.h>
 
 class CameraDevice;
-class ThreadRpc;
 
 class CameraProxy
 {
@@ -35,8 +34,6 @@ public:
 	camera3_device_t *camera3Device() { return &camera3Device_; }
 
 private:
-	void threadRpcCall(ThreadRpc &rpcRequest);
-
 	unsigned int id_;
 	CameraDevice *cameraDevice_;
 	camera3_device_t camera3Device_;