meta-quanta: q71l: enable phosphor-host-postd package

Add the phosphor-host-postd package to the build.  The lpc snooping is
enabled in the device-tree.

Change-Id: I32e6dd63d9a412726b3cc094b7441d46305b79e8
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/meta-q71l/recipes-phosphor/images/obmc-phosphor-image.bbappend b/meta-q71l/recipes-phosphor/images/obmc-phosphor-image.bbappend
index 6124ab0..760a6b8 100644
--- a/meta-q71l/recipes-phosphor/images/obmc-phosphor-image.bbappend
+++ b/meta-q71l/recipes-phosphor/images/obmc-phosphor-image.bbappend
@@ -1,3 +1,6 @@
 OBMC_IMAGE_EXTRA_INSTALL_append_quanta-q71l = " spictrl"
 OBMC_IMAGE_EXTRA_INSTALL_append_quanta-q71l = " quanta-powerctrl"
 
+# dts for q71l includes snooping, so let's leverage that.
+OBMC_IMAGE_EXTRA_INSTALL_append_quanta-q71l = " phosphor-host-postd"
+