Disable entropy gathering for MMC device (cyanogen) and add few missing things from Andromadus' vision repo

Original commit for entropy gathering: https://github.com/Andromadus/android_device_htc_vision/commit/2ee1e727083da5908f8b45d6bcf07b7d178b4610

Change-Id: I139fc7fdfd78b40776fe0b9b3fb1a615e016d6f1