NFSD: Fold fault_inject.h into state.h

There were only a small number of functions in this file and since they
all affect stored state I think it makes sense to put them in state.h
instead.  I also dropped most static inline declarations since there are
no callers when fault injection is not enabled.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index d902f83..e13cbdd 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -19,7 +19,7 @@
 #include "idmap.h"
 #include "nfsd.h"
 #include "cache.h"
-#include "fault_inject.h"
+#include "state.h"
 #include "netns.h"
 
 /*