Add logging for mQsExpandImmediate changes

I suspect reason for QS sometimes disappearing in split shade might have something to do with this value not being set correctly.
Also it's not changing that often - twice per expand/collapse - so should be good to log.

Bug: 219589379
Test: just adding logs
Change-Id: Ic6ef9416c7198109905cfdf16ce4e998cd398f80