UBUNTU: SAUCE: IMX51: fix stgl5000 regulator_get failing error

BugLink: http://bugs.launchpad.net/bugs/567157

In Freescale BSP, commit 2d75a8fa9d7c7272b3b81268c2fb33a57be9a072 removes
regulator_consumer_supply VDDD which will be used by stgl5000 driver. So it
will give us an error message during booting:

'regulator: Unable to get requested regulator: VDDD'

This patch added it back and fix this error.

Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>