bhyve: Remove some unneeded includes of segments.h

They are not needed and are specific to x86.  No functional change
intended.

MFC after:	1 week
Sponsored by:	Innovate UK

usr.sbin/bhyve/inout.c

@@ -37,7 +37,6 @@ __FBSDID("$FreeBSD$");
 #include <sys/mman.h>
 
 #include <x86/psl.h>
-#include <x86/segments.h>
 
 #include <machine/vmm.h>
 #include <machine/vmm_instruction_emul.h>

usr.sbin/bhyve/snapshot.c

@@ -47,7 +47,6 @@ __FBSDID("$FreeBSD$");
 #include <sys/un.h>
 
 #include <machine/atomic.h>
-#include <machine/segments.h>
 
 #ifndef WITHOUT_CAPSICUM
 #include <capsicum_helpers.h>

usr.sbin/bhyve/task_switch.c

@@ -34,7 +34,6 @@ __FBSDID("$FreeBSD$");
 #include <sys/mman.h>
 
 #include <x86/psl.h>
-#include <x86/segments.h>
 #include <x86/specialreg.h>
 #include <machine/vmm.h>
 #include <machine/vmm_instruction_emul.h>