Staging: winbond: Fix for brace style, length and whitespace in mac_structures.h

This patch fixes line length, brace style and whitespace issues in the
mac_structures.h file found by the checkpatch.pl tool

Signed-off-by: Adam Latham <adam.latham@unisontorbay.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>