xfs: clean up xfs_bit.h includes

With the removal of xfs_rw.h and other changes over time, xfs_bit.h
is being included in many files that don't actually need it. Clean
up the includes as necessary.

Also move the only-used-once xfs_ialloc_find_free() static inline
function out of a header file that is widely included to reduce
the number of needless dependencies on xfs_bit.h.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

fs/xfs/xfs_dquot_item.c

@@ -17,7 +17,6 @@
  */
 #include "xfs.h"
 #include "xfs_fs.h"
-#include "xfs_bit.h"
 #include "xfs_log.h"
 #include "xfs_trans.h"
 #include "xfs_sb.h"