[GFS2] Remove semaphore.h from C files

We no longer use semaphores, everything has been converted to
mutex or rwsem, so we don't need to include this header any more.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/ops_file.c

@@ -22,7 +22,6 @@
 #include <linux/ext2_fs.h>
 #include <linux/crc32.h>
 #include <linux/iflags.h>
-#include <asm/semaphore.h>
 #include <asm/uaccess.h>
 
 #include "gfs2.h"