x86: remove sys/mount.h from genassym.c

The header is not needed, and causes some issues with build because it
requires vnode_if.h generated due to transient dependency from vnode.h.

While there, remove unneeded explicit sys/cdefs.h and sys/param.h usage.

Reported and tested by:		thierry
Fixes:	1d5e4020e3 ("vnode: add VIRF_KNOTE flag")
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

sys/amd64/amd64/genassym.c

@@ -32,11 +32,9 @@
  * SUCH DAMAGE.
  */
 
-#include <sys/cdefs.h>
 #include "opt_hwpmc_hooks.h"
 #include "opt_kstack_pages.h"
 
-#include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/assym.h>
 #include <sys/bio.h>
@@ -46,7 +44,6 @@
 #include <sys/pmckern.h>
 #endif
 #include <sys/errno.h>
-#include <sys/mount.h>
 #include <sys/mutex.h>
 #include <sys/socket.h>
 #include <sys/resourcevar.h>

sys/i386/i386/genassym.c

@@ -32,12 +32,10 @@
  * SUCH DAMAGE.
  */
 
-#include <sys/cdefs.h>
 #include "opt_apic.h"
 #include "opt_hwpmc_hooks.h"
 #include "opt_kstack_pages.h"
 
-#include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/assym.h>
 #include <sys/bio.h>
@@ -47,7 +45,6 @@
 #endif
 #include <sys/proc.h>
 #include <sys/errno.h>
-#include <sys/mount.h>
 #include <sys/mutex.h>
 #include <sys/socket.h>
 #include <sys/resourcevar.h>