SystemUI: fix multi touch gestures and extra jank

The dejank utils were getting a little ahead of themselves: in between
the panel height being set to 0 (could happen often), and the user
actively trying to expand the panel, the next layout traversal from the
dejank utils would try to collapse the panel, causing bad states.

Also in the qs height animator updater, be careful to only actively
update the end height when the user did not just peak.

Finally, and most importantly, we need to disable motion event splitting
in our view that holds our notification panel logic so we can get multi
touch gestures in those views properly.

Ticket: CYNGNOS-2756
Change-Id: I2cda440d4e0548d3477c6fad88f7dac1cb59d9db
Signed-off-by: Roman Birg <roman@cyngn.com>