Adding MSDL haptics for dragging app icons in Workspace and Hotseat.

The feedback occurs when an icon hovers over an empty available space in
Workspace and Hotseat, as well as over other icons to create folders.
This is now compliant with the Multi-sensory Design Language spec.

Test: manual. Verified haptics while dragging icons over Workspace and
  Hotseat.
Test: manual. Verified haptics with adb shell dumpsys of Launcher and
  checking the MSDL token history.
Flag: com.android.launcher3.msdl_feedback
Bug: 371314631

Change-Id: I7d039ddf9d05faa39a6e6e3f9a84217d8916adc0