ARM: dts: imx6q: update cpufreq volt/freq table

According to latest i.MX6Q datasheet Rev. 3, 02/2014,
the latest cpufreq volt/freq table is as below:

LDO enabled/bypassed(min value):
996MHz: VDDARM: 1.225V, VDDSOC: 1.150V;
792MHz: VDDARM: 1.150V, VDDSOC: 1.150V;
396MHz: VDDARM: 0.925V, VDDSOC: 1.150V;

the 792MHz setpoint's VDDARM min voltage is updated
from 1.125V to 1.150V, adding 25mV to cover board IR
drop, 1.175V is the right voltage we should use.

Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>