Revert "Bug 1106411 - [PrivacyPanel] Change role to system"

This reverts commit b84a94ee25edaf3ee32461ea3299d57ff1a6a4f0.
Bug 1110673 - [System] When disabling/enabling auto-brightness, the previous brightness is not restored r=timdream
Bug 1110673 - merge pull request #26737 from julienw:1110673-fix-regression-with-previousLux to mozilla-b2g:master
Revert "Fixes bug 1046900, Adding telugu keyboard to FxOS"
Merge pull request #26755 from mozilla-b2g/revert-26708-Patch_1046900

Revert "Fixes bug 1046900, Adding telugu keyboard to FxOS" for causing bug 1111352