Add TunnelModeStateListener in java+jni

When tunnel mode is being used (meaning when there
is a sideband stream in one of the layers in SurfaceFlinger), the
blur can't be computed over that layer. In that case, SF blurs are
disabled, which results in a translucent buffer to be drawn.

This CL introduces a listener, which is registered with the
SurfaceFlinger and receives a callback whenever the tunnel mode
enabled state changes. This way, the BlurController can properly send
updates to apps that blurs are disabled/enabled.

Bug: 171457637
Test: atest TunnelModeStateListenerTest
Test: atest TunnelModeStateReporterTest
Change-Id: I6ffba1c342352ad65a32c0efc4ecbc07811245d9