Don't sign DSPManager with the platform certificate.

There's no real need to do so, and it prevents disabling it.

Change-Id: Ie4797103cf97eec2f37ebe900da5981c33eddd5d
Merge "Don't sign DSPManager with the platform certificate." into cm-10.2
Merge branch 'cm-10.2' of git://github.com/CyanogenMod/android_packages_apps_DSPManager into cm-10.2