greybus: gpbridge.h: whitespace cleanups

Replace #define<TAB> with #define<SPACE>.

Also move the #ifdef block to below the initial comment block, like
other .h files are.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/gpbridge.h

-#ifndef __GB_GPBRIDGE_H__
-#define __GB_GPBRIDGE_H__
 /*
  * This file is provided under a dual BSD/GPLv2 license.  When using or
  * redistributing this file, you may do so under either license.
@@ -51,6 +49,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef __GB_GPBRIDGE_H__
+#define __GB_GPBRIDGE_H__
 
 /* I2C */