Update Beagle init so it uses the new power resource hooks
to make sure that various regulators are initially off.
(Example, u-boot enables VAUX3, which isn't even wired up!!)

Also, add VPLL2 to the set of regulators used, and hook it
up to the LCD driver.  VPLL powers the digital video outputs;
for rev B boards, that's DVI only.

Drivers need to use regulator calls to enable these later.
USB and MMC handle this corrrectly (although not yet for
MMCplus cards, with 8-bit data).  The video driver doesn't.
NYET-Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>