staging: brcm80211: Removed unnecessary pktsetprio() function.

This function is completely unnecessary, as packet classification is done
higher up in the stack.  As used, the function actually mis-classifies frames
in some cases since it overwrites the classification done by the stack.

Signed-off-by: Henry Ptasinski <henryp@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>