phosphor-inventory-manager: fix missing python dep

The repo runs python to generate code or validate config, which requires
python and the dependent python packages.
Previously that happens to be satisfied by sdbusplus's RDEPENDS. If
sdbusplus is changed to use python3, this repo fails to built because it
lacks of dependency.

See details in
https://lists.ozlabs.org/pipermail/openbmc/2020-February/020771.html

This commit fixes the depends by adding the required python and
python-packages so that it builds fine.

(From meta-phosphor rev: 89d17815d5fd3a5247479feb01682c741698a8b5)

Change-Id: I09852819750d4faa320a9b9f236bb9ee2de94fc5
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-phosphor/recipes-phosphor/inventory/phosphor-inventory-manager_git.bb b/meta-phosphor/recipes-phosphor/inventory/phosphor-inventory-manager_git.bb
index 520cdcc..9b5530b 100644
--- a/meta-phosphor/recipes-phosphor/inventory/phosphor-inventory-manager_git.bb
+++ b/meta-phosphor/recipes-phosphor/inventory/phosphor-inventory-manager_git.bb
@@ -23,6 +23,9 @@
         sdbusplus-native \
         autoconf-archive-native \
         libcereal \
+        ${PYTHON_PN}-native \
+        ${PYTHON_PN}-pyyaml-native \
+        ${PYTHON_PN}-mako-native \
         "
 
 OBMC_INVENTORY_PATH="${OBMC_DBUS_PATH_ROOT}/inventory"