QuietHours: disable volume change tone during quiet hours

* Its quiet time, you're trying to be quiet, why would the volume
  change make noise when you're being quiet?
* Turn this off when system sounds are disabled during quiet hours

Change-Id: I6c7eb9d52f5dab9349bf2b8f72ddcb0ab45834fa
Revert "Telephony: Add data rat constant"

See http://review.cyanogenmod.org/#/c/55832/ for reasons.

This reverts commit 60f79613897f74cacceafad7bcd7260fe25bb1e5.

Change-Id: I7eea322dec1cbb3df33e4ee10d4e73fde0c6e934