base: Fix margin layouts params of MobileNetworkTile

MobileNetworkTile use an internal frame, so we need to restrict frame margins instead of image margin

Change-Id: I1861866c814eece7911f6fc4a5671575173c12e0
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Merge pull request #2 from CyanogenMod/cm-11.0

base: Fix margin layouts params of MobileNetworkTile