ARM: dts: omap5: Increase max-voltage of pbias regulator

As per recent TRM, PBIAS cell on omap5 devices supports
3.3v and not 3.0v as documented earlier.

Update PBIAS regulator max voltage to match this.

Document reference:
SWPU249AF - OMAP543x Technical reference manual August 2016

Signed-off-by: Ravikumar Kattekola <rk@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>