phosphor: hwmon: add missing stdplus dependency

Add missing dependency on stdplus in recipe.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I4d1f90cc689ac54e856a487a207a3b582e574f9f
diff --git a/recipes-phosphor/sensors/phosphor-hwmon_git.bb b/recipes-phosphor/sensors/phosphor-hwmon_git.bb
index 3207df4..5ccf99c 100644
--- a/recipes-phosphor/sensors/phosphor-hwmon_git.bb
+++ b/recipes-phosphor/sensors/phosphor-hwmon_git.bb
@@ -18,6 +18,7 @@
 DEPENDS += " \
         sdbusplus \
         sdeventplus \
+        stdplus \
         phosphor-dbus-interfaces \
         phosphor-logging \
         gpioplus \