settings: Add text plain battery style

Patchset 2: Fixed dependents
Patchset 3: Rebased

Requires: http://review.cyanogenmod.org/#/c/56038/

Change-Id: Ieb45b23bcfc850dbee6577885fb2f8312d19bdd6
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>