iopsys-econet: Add 2,5 Gb phy support

Bartlomiej Grzeskowiakrequested to merge
bg_add_25Gb_phy into devel

FYI: @sukrus @LukaszK @Marek

Enable 2,5Gb phy support handled by RTL8221B chip.

Signed-off-by: Bartlomiej Grzeskowiak bartlomiej.grzeskowiak@iopsys.eu

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