Add driver for Seiko Instruments Inc. 4.3" WVGA (800 x RGB x 480)
TFT with Touch-Panel.

Datasheet available at:
http://www.glyn.de/data/glyn/media/doc/43wvf1g-0.pdf

Seiko 43WVF1G panel has two power supplies: avdd and dvdd and they
require a specific power on/down sequence.
For this reason the simple panel driver cannot be used to drive this
panel, so create a new one heavily based on simple panel.

Based on initial patch submission from Breno Lima.

Signed-off-by: Marco Franchi <marco.franchi@nxp.com>
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Changes since v1:
-Change supply names to dvdd-supply and avdd-supply