Add udev rule file for iio-hwmon type drivers

Resolves openbmc/openbmc#1825

Change-Id: I67e254c6fccd74cd4334dc57a5698074a7183968
Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
diff --git a/common/recipes-phosphor/sensors/phosphor-hwmon/70-iio.rules b/common/recipes-phosphor/sensors/phosphor-hwmon/70-iio.rules
new file mode 100644
index 0000000..f332d11
--- /dev/null
+++ b/common/recipes-phosphor/sensors/phosphor-hwmon/70-iio.rules
@@ -0,0 +1 @@
+SUBSYSTEM=="iio", ACTION=="add", TAG+="systemd", ENV{SYSTEMD_WANTS}+="xyz.openbmc_project.Hwmon@%E{OF_FULLNAME}.service"