DisplaySettings: Add hardware-framework support for tap-to-wake

Since we have tap-to-sleep globally, might as well support the
wake gesture as a standalone thing through the HAF. Place it in
"Display".

Change-Id: I10396068612aa9f7dab438290196c8dbfe95fd4b

Settings: persist double tap to wake state
After disabling double tap to wake and rebooting, the state would be
persisted in the device, but it would display incorrect checkbox state.

Fixes JIRA bug BACON-92

Change-Id: Ie99e59872778dcdc3028e1770d97507fd831f515
Signed-off-by: Roman Birg <roman@cyngn.com>
Statusbar: double-tap to sleep (settings part)

Change-Id: I65961b2206287a3b2198737c42ab4a27aa041bc3