Settings: disable report button for system apps

This opens CMBugReport, and we don't want these reports. Disable the
button for better UX than the button doing nothing when clicking it.

Change-Id: I2563379e7ce49a246761c040edcb797cf112efce
Signed-off-by: Roman Birg <roman@cyngn.com>
Merge branch 'cm-12.0' of https://github.com/RazgrizEzz/android_packages_apps_Settings into cm-12.0