ppp: Replace uses of <linux/if_ppp.h> with <linux/ppp-ioctl.h>

Since all that include/linux/if_ppp.h does is #include <linux/ppp-ioctl.h>,
this replaces the occurrences of #include <linux/if_ppp.h> with
#include <linux/ppp-ioctl.h>.

It also corrects an error in Documentation/networking/l2tp.txt, where
it referenced include/linux/if_ppp.h as the source of some definitions
that are actually now defined in include/linux/if_pppol2tp.h.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index a26bea1..10d8cd9 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -34,7 +34,7 @@
 #include <linux/fs.h>
 #include <linux/file.h>
 #include <linux/ppp_defs.h>
-#include <linux/if_ppp.h>
+#include <linux/ppp-ioctl.h>
 #include <linux/if_pppox.h>
 #include <linux/mtio.h>
 #include <linux/auto_fs.h>