Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/pci/Build b/tools/pci/Build
new file mode 100644
index 0000000..c375aea
--- /dev/null
+++ b/tools/pci/Build
@@ -0,0 +1 @@
+pcitest-y += pcitest.o