UI updates for support tab.

Fixes: 29999181
Fixes: 29397123

- Reduce support tile min height to 48dp.
- Add a 8dp spacer between escalation card and first support tile.
- Show different off-hour support escalation title when support hour is
  always avaiable.

Change-Id: I4dacf2b375734c4819b9b19b68fc84faf083c0d4