fix i386 build with CPU_ELAN (LINT for instance) after r331878

x86/cpu_machdep.c now needs to include elan_mmcr.h when CPU_ELAN is set.
While here, also remove the now unneeded inclusion of isareg.h in i386
and amd64 vm_machdep.c.

Reported by:	lwhsu
MFC after:	14 days
X-MFC with:	r331878

sys/amd64/amd64/vm_machdep.c

@@ -82,8 +82,6 @@ __FBSDID("$FreeBSD$");
 #include <vm/vm_map.h>
 #include <vm/vm_param.h>
 
-#include <isa/isareg.h>
-
 _Static_assert(OFFSETOF_CURTHREAD == offsetof(struct pcpu, pc_curthread),
     "OFFSETOF_CURTHREAD does not correspond with offset of pc_curthread.");
 _Static_assert(OFFSETOF_CURPCB == offsetof(struct pcpu, pc_curpcb),

sys/i386/i386/vm_machdep.c

@@ -79,10 +79,6 @@ __FBSDID("$FreeBSD$");
 #include <machine/smp.h>
 #include <machine/vm86.h>
 
-#ifdef CPU_ELAN
-#include <machine/elan_mmcr.h>
-#endif
-
 #include <vm/vm.h>
 #include <vm/vm_extern.h>
 #include <vm/vm_kern.h>
@@ -90,8 +86,6 @@ __FBSDID("$FreeBSD$");
 #include <vm/vm_map.h>
 #include <vm/vm_param.h>
 
-#include <isa/isareg.h>
-
 #ifndef NSFBUFS
 #define	NSFBUFS		(512 + maxusers * 16)
 #endif

sys/x86/x86/cpu_machdep.c

@@ -85,6 +85,9 @@ __FBSDID("$FreeBSD$");
 #ifdef SMP
 #include <machine/smp.h>
 #endif
+#ifdef CPU_ELAN
+#include <machine/elan_mmcr.h>
+#endif
 #include <x86/acpica_machdep.h>
 
 #include <vm/vm.h>