bcm: Fixing a few checkpatch issues in InterfaceMisc.h

Just cleaned up a few issues presented by checkpatch in InterfaceMisc.h.
I converted some spaces to tabs, and removed unnecessary whitespace. The
kernel version I am using linux-next-20140411.

Signed-off-by: Julian Gindi <juliangindi@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>