quanta: q71l: Fix build

e.g.
ERROR: Nothing RPROVIDES 'virtual-obmc-system-mgmt' (but /home/peter/openbmc/meta-phosphor/recipes-phosphor/images/obmc-phosphor-image.bb RDEPENDS on or otherwise requires it)

Signed-off-by: Peter Foley <pefoley@google.com>
Change-Id: I40f1dc3537073dbf02a702c9f1f64ada36384179
diff --git a/meta-quanta/meta-q71l/conf/machine/quanta-q71l.conf b/meta-quanta/meta-q71l/conf/machine/quanta-q71l.conf
index f941ff1..dc36d9b 100644
--- a/meta-quanta/meta-q71l/conf/machine/quanta-q71l.conf
+++ b/meta-quanta/meta-q71l/conf/machine/quanta-q71l.conf
@@ -27,6 +27,8 @@
 #        "
 # But we don't, and it's ok :D  We're pulling in specific packages in an image recipe.
 
+IMAGE_FEATURES:remove = "obmc-system-mgmt"
+
 # These are meant to include the inventory config.yaml and so on.
 PREFERRED_PROVIDER_virtual/phosphor-ipmi-fru-inventory = "q71l-ipmi-inventory-map-native"
 PREFERRED_PROVIDER_virtual/phosphor-ipmi-sensor-inventory = "q71l-ipmi-sensor-map-native"