staging:rtl8192e: Rewrite macro definition as static inline function.

This patch removes the checkpatch.pl error Macros "with complex values
should be enclosed in parenthesis" in dot11d.h by rewriting it as a
static inline function.

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>