soc: imx: Add GPCv2 power gating driver

Add code allowing for control of various power domains managed by GPCv2
IP block found in i.MX7 series of SoCs. Power domains covered by this
patch are:

    - PCIE PHY
    - MIPI PHY
    - USB HSIC PHY
    - USB OTG1/2 PHY

Support for any other power domain controlled by GPC is not present, and
can be added at some later point.

Testing of this code was done against a PCIe driver.

Cc: [email protected]
Cc: Lucas Stach <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: Dong Aisheng <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Andrey Smirnov <[email protected]>
Signed-off-by: Shawn Guo <[email protected]>

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