[SF] Update DeviceProductInfo on hotplug reconnect

This change populates DeviceProductInfo on hotplug, even if we are
in legacy multi-display mode. This behaviour is guarded by sysprop
ro.surface_flinger.update_edid_on_hotplug_reconnect which is
turned off by default.

Bug: 160952291
Test: 1. connect display
      2. adb shell dumpsys SurfaceFlinger | grep deviceProductInfo
      3. connect different display
      4. adb shell dumpsys SurfaceFlinger | grep deviceProductInfo
      5. make sure DeviceProductInfo has changed.

Change-Id: I94751f678b1dd1196727ad38ab5e398fb6cf0393