ENGR00269945 ARM: imx: Enable PU power

PU is turned off in uboot, so we need to turn it on here
to avoid kernel hang during GPU init.
PU power enable need to follow the flows:

1. Enable xPU's clk;
2. Enable PU power rail and wait for PU power stable;
3. Enable PU power gate in GPC;

Otherwise, some chips' PU may not work.

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

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