3430SDP init updates

OMAP 3430 SDP init updates:

 - Provide a more correct address for the Ethernet chip, getting
   rid of a warning during system boot
 - Hook up the various MMC card cage switches (init MMC later)
 - Configure pullups on the unused twl4030 GPIOs
 - Set up the GPIOs coupled to the (optional) SPI display
 - Initialize various regulators

Note that some SDP boards (all rev2 versions?) use a twl5030 not
the older twl4030 chip.  This isn't changed here.  It'd be a bit of
work to detect (fetch configuration data from the FPGA), and doesn't
much matter since the main change would be that VAUX2 could support
more voltages, but it's supposed to be fixed at 2.8V.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>