openpower-occ-control: Update recipe and SRCREV to python3native

The python file in the repo has already been changed to use python3
explicitly, so update the SRCREV to get the latest.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Change-Id: I6e7abedf840630d59a72a9bad58a8e28dc26d304
diff --git a/recipes-phosphor/occ/openpower-occ-control_git.bb b/recipes-phosphor/occ/openpower-occ-control_git.bb
index b76894d..aaab247 100644
--- a/recipes-phosphor/occ/openpower-occ-control_git.bb
+++ b/recipes-phosphor/occ/openpower-occ-control_git.bb
@@ -7,7 +7,7 @@
 inherit autotools \
         pkgconfig \
         obmc-phosphor-dbus-service \
-        pythonnative \
+        python3native \
         phosphor-dbus-yaml
 
 require ${PN}.inc