ENGR00220388 [MX6]Adjust SOC/PU voltage according to datasheet

ENGR00220388 [MX6]Adjust SOC/PU voltage according to datasheet

SOC/PU voltage need to following some rules according to latest
datasheet:

1. SOC/PU CAP voltage must be 1.15V <= SOC/PU <= 1.3V;
2. SOC and PU must be same as they don't have level shift;
3. Adjust previous wrong voltage setting.

If SOC/PU voltage is too low, may cause system crash on some
chips, we have a board that easily crash with GPU working and
doing some tar operation, with this voltage adjust, this issue
fixed.

Signed-off-by: Anson Huang <b20788@freescale.com>