Revert "Remove double tap, make long press to enable torch [2/2]"

Several people liked double tap better.h

This reverts commit e55606d453404af9fc92a9ceab543bc1b5e9be72.

Change-Id: If51bcbc3581b54d2d0302f619a6983c87d39e795
Merge commit 'refs/changes/38/1838/1' of https://review.carbonrom.org/CarbonDev/android_packages_apps_CarbonFibers into overscroll