With recent changes happened in OMAP2/3 DSS library for regulator interface, it
is required to define DSI regulator supply, without this DSS (in turn Fbdev)
fails to get regulator.
Signed-off-by: NVaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>