BHV-2871: Add support for branding image to Panels.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
BHV-2871: Updated widths so that horizontal and vertical margin for the branding image is the same.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
BHV-2871: Removed redundant call to brandingSrcChanged, restrict setting of branding image to activity pattern.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
BHV-2871: Move branding image to different scrim to not interfere with light theme.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
BHV-2871: Consolidate rules.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
BHV-2871: Update generated CSS.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
Merge pull request #1220 from enyojs/BHV-2871-aarontam-1

BHV-2871: Add support for branding image to Panels.

Reviewed-By: Cole Davis (cole.davis@lge.com)