[Replicant] i9305: Add support for rt2500usb wifi devices

[Joonas Kylmälä]

Hi,

The attached patches for kernel_samsung_smdk4412 enable support for wifi
usb dongles that use RT2500USB chipset. The patch #2 is from
<https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=v3.14.79&id=8b0df00fe650197ac47c42ba71b2588334a529be>
and is important to have because otherwise if power save is enabled some
devices work only at a speed of 40kb/s.

The patch set was tested on i9305 device. Feel free to enable the kernel
module on other devices.

Joonas
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