Remove python from libxml2 PACKAGECONFIG

We don't use python on the BMC, but things that were pulling in libxml2
were pulling libpython.so onto the bmc.  Fix it.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I6897f637676ee361522132d6b73211c9fccaca1c
diff --git a/meta-phosphor/recipes-core/libxml2/libxml2_%.bbappend b/meta-phosphor/recipes-core/libxml2/libxml2_%.bbappend
new file mode 100644
index 0000000..97b68bc
--- /dev/null
+++ b/meta-phosphor/recipes-core/libxml2/libxml2_%.bbappend
@@ -0,0 +1,2 @@
+# OpenBMC doesn't use python anymore, so no need for libxml python bindings
+PACKAGECONFIG:openbmc-phosphor:class-target = ""