bmc: Create runtime directory for non-persistent configs

Change-Id: I32012e7e798bae5a1c5b02e39b32dc40ba3b580a
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/bmc/firmware-handler/Makefile.am b/bmc/firmware-handler/Makefile.am
index c12838d..1ec7aa3 100644
--- a/bmc/firmware-handler/Makefile.am
+++ b/bmc/firmware-handler/Makefile.am
@@ -25,6 +25,11 @@
 dist_pkgdata_DATA += config-bios.json
 endif
 
+if HAVE_TMPFILESDIR
+tmpfiles_DATA = \
+	phosphor-ipmi-flash.conf
+endif
+
 if HAVE_SYSTEMUNITDIR
 systemdsystemunit_DATA = \
 	phosphor-ipmi-flash-bmc-prepare.target \