init: Disable entropy gathering for MMC device
* Flash devices aren't a good source of entropy and contributing to the
   pool can be an expensive operation requiring needless locking.

author: @cyanogen
dhcp: Add CLIENTID request to dhcpcd service
backported from tuna
see https://github.com/CyanogenMod/android_device_samsung_tuna/commit/62532ce655d9f10166d9193003f4d8b21e59a227