brcm63xx: temporary workaround for XUG534, provide falback nvram settings

Marek Puzyniakrequested to merge
xug534_nvram_fallback into devel

Signed-off-by: Marek Puzyniak marek.puzyniak@iopsys.eu

@sukrus @janusz Please take a look. Temporary solution to have wifi running on XUG534 just after flashing.

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