Revert "Settings: Show our firmware version in About G-/MediaBox"

This reverts commit 160260bff054d8b37b8fcc7a4398ae2e5329a9f9.

* Firmware revision is now the 'BUILD_NUMBER' and thus Firmware Revision is duplication

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>

Conflicts:
	src/com/android/settings/DeviceInfoSettings.java