CM PlatLogo: CyanogenMod version preference (2/2)

Binds the CyanogenMod version preference to launch CM easter egg
upon multiple taps.

Change-Id: I8e06642944d24581c0932c9964f2d9615bfcb832
[3/4] Settings: Audio Themes Settings
[4/4] Settings: Audio Themes Settings
Change-Id: I8d9be84a55c892f159359b6fe47d1c9249bc0326
We use KEY_CM_VERSION