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pc, pc64: disable all pci devices for /dev/reboot

Make sure all pci busmaster activity is disabled,
including MSI/MSI-X interrupts, before switching
control to the new kernel.

--- a/sys/src/9/pc/main.c

+++ b/sys/src/9/pc/main.c

@@ -5,6 +5,7 @@

 #include	"dat.h"

 #include	"fns.h"

 #include	"io.h"

+#include	"../port/pci.h"

 #include	"ureg.h"

 #include	"pool.h"

 #include	"rebootcode.i"

@@ -688,6 +689,9 @@

 	/* shutdown devices */

 	chandevshutdown();

+

+	/* disable pci devices */

+	pcireset();

 	rebootjump((ulong)entry & ~0xF0000000UL, PADDR(code), size);

 }

--- a/sys/src/9/pc64/main.c

+++ b/sys/src/9/pc64/main.c

@@ -5,6 +5,7 @@

 #include	"dat.h"

 #include	"fns.h"

 #include	"io.h"

+#include	"../port/pci.h"

 #include	"ureg.h"

 #include	"pool.h"

 #include	"rebootcode.i"

@@ -285,6 +286,9 @@

 	/* shutdown devices */

 	chandevshutdown();

+

+	/* disable pci devices */

+	pcireset();

 	rebootjump((uintptr)entry & (ulong)~0xF0000000UL, PADDR(code), size);

 }