Specify surface to existing control panel activity

Add intent extra to the existing panel activity to specify the surface
it is being shown on. Ensure this is only sent if the proper flag is
enabled.

Bug: 311743064
Flag: ACONFIG FLAG_HOME_PANEL_DREAM DEVELOPMENT
Test: atest ControlsUiControllerImplTest
Change-Id: Iba50a070ea2d2db24b03087d5bcdc0cd9c925e59