ramdisk: don't start a sensors service that we don't have

This causes the system to wake up approximately every 5 seconds
to keep trying to start this service that does not exist.

Change-Id: Ibc45033e0f7c8e6734822af2b32590dd23f4bebd
Merge pull request #28 from crpalmer/cm-10.1-chad-sensors

ramdisk: don't start a sensors service that we don't have