staging: brcm80211: delete empty brcmfmac/README file

brcm80211/brcmfmac/README contents were move to brcm80211/README previously,
but this empty file is still around.
Signed-off-by: NHenry Ptasinski <henryp@broadcom.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/brcm80211/brcmfmac/README

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