Include "opt_kbd.h" since certain structures size depend on the value

of KBDIO_DEBUG which may be defined in the kernel config (as it is in NOTES).

This kind of bug is a _really_ horribly thing as we end up with one bit
of code thinking a particular structure is 136 bytes and another that it
is only 112 bytes.

Ideally all places would remember to #include the right "opt_foo.h" file,
but I think in practice file containing the variable sized struct should
#include it explicitly as a precaution.

Detected by:	FlexeLint

sys/dev/atkbdc/atkbdcreg.h

@@ -34,6 +34,8 @@
 #ifndef _DEV_KBD_ATKBDCREG_H_
 #define	_DEV_KBD_ATKBDCREG_H_
 
+#include "opt_kbd.h"	/* Structures depend on the value if KBDIO_DEBUG */
+
 /* constants */
 
 /* I/O ports */

sys/dev/kbd/atkbdcreg.h

@@ -34,6 +34,8 @@
 #ifndef _DEV_KBD_ATKBDCREG_H_
 #define	_DEV_KBD_ATKBDCREG_H_
 
+#include "opt_kbd.h"	/* Structures depend on the value if KBDIO_DEBUG */
+
 /* constants */
 
 /* I/O ports */