fireball: clear up inherrited package.
fireball: clear up inherrited package.

* this seems to be inherrited from
https://github.com/CyanogenMod/android_vendor_cm/blob/cm-12.0/config/common.mk#L159

Change-Id: I0f6967121a6e981977d42c94c7a1442a25a02fb0

mdmower/android_device_htc_fireball,mdmower/android_device_htc_fireball