arm64: fix the LINT-ACPI build

This file uses VM_MEMATTR_DEVICE_NP, which it gets through header
pollution somewhere with FDT enabled.  Pull in vm/vm.h to make it
explicit.

sys/arm64/cavium/thunder_pcie_pem.c

@@ -42,6 +42,8 @@ __FBSDID("$FreeBSD$");
 #include <sys/rman.h>
 #include <sys/endian.h>
 
+#include <vm/vm.h>
+
 #ifdef FDT
 #include <dev/ofw/openfirm.h>
 #include <dev/ofw/ofw_bus.h>