omap3: pandora: update regulator setup

Update pandora's regulator setup:
- add new regulators: VAUX2, VAUX4 and VSIM
- add new consumers: ads7846, nub controllers, USB PHY, audio DAC
- use dev names instead of struct device pointers

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>