phosphor-hwmon: add gpioplus dependency

Phosphor-hwmon will introduce the ability to
configure via GPIO and leverage the gpioplus library
to handle this.

Change-Id: I4085afc27e03ef8b4efe6ea0c957d77cd662c4dd
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/recipes-phosphor/sensors/phosphor-hwmon.bb b/recipes-phosphor/sensors/phosphor-hwmon.bb
index e5e46f9..6cb09bc 100644
--- a/recipes-phosphor/sensors/phosphor-hwmon.bb
+++ b/recipes-phosphor/sensors/phosphor-hwmon.bb
@@ -18,6 +18,7 @@
         sdbusplus \
         phosphor-dbus-interfaces \
         phosphor-logging \
+        gpioplus \
         "
 
 
@@ -25,6 +26,7 @@
         sdbusplus \
         phosphor-dbus-interfaces \
         phosphor-logging \
+        gpioplus \
         bash \
         "