amd64/devpmc: devpmc.c includes an amd64 path, don't know why it was ever in port/

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>

sys/src/9/amd64/core.json

@@ -74,8 +74,9 @@
 		        "coreboot.c",
 			"ctype.c",
 			"devarch.c",
-			"../port/devpci.c",
 			"../port/devdraw.c",
+			"../port/devpci.c",
+			"devpmc.c",
 			"fpu.c",
 			"i8254.c",
 			"i8259.c",

sys/src/9/port/port.json

@@ -29,7 +29,6 @@
 			"../port/devmntn.c",
 			"../port/devmouse.c",
 			"../port/devpipe.c",
-			"../port/devpmc.c",
 			"../port/devproc.c",
 			"../port/devregress.c",
 			"../port/devroot.c",