Load environment variables earlier

[Oleksij Rempel]

Am 15.09.2017 um 04:33 schrieb zjh:
>  think the environment variables should be loaded before the device is registered,
>  so when the device is registered, it can be initialized according to the environment variable.

Please take look at drivers/usb/gadget/f_fastboot.c. it is already using
env variables.

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