systemui: Add text plain battery style

Patchset 2: Fixed issues
            Shared anim offset between battery views (uptaded by the master view)
Patchset 3: More fixes
            Revert shared anim (is not viable)
Patchset 4: Fixed coding style
            Rebased
Patchset 5: Use system clock font
            Fix vertical aligment with system clock
            Rebased

Settings Change-Id: http://review.cyanogenmod.org/#/c/56039/

Change-Id: Ie288e58d5ce4f5c4d68d9ace31b333e82b4bff59
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>