phosphor-time-manager: use python3

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I4bc6661164bd34cc72436daec4316077eb4fa994
diff --git a/recipes-phosphor/datetime/phosphor-time-manager_git.bb b/recipes-phosphor/datetime/phosphor-time-manager_git.bb
index dfa435b..ebb6427 100644
--- a/recipes-phosphor/datetime/phosphor-time-manager_git.bb
+++ b/recipes-phosphor/datetime/phosphor-time-manager_git.bb
@@ -5,7 +5,7 @@
 
 LICENSE = "Apache-2.0"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=e3fc50a88d0a364313df4b21ef20c29e"
-inherit autotools pkgconfig pythonnative
+inherit autotools pkgconfig python3native
 inherit obmc-phosphor-dbus-service
 
 DEPENDS += "autoconf-archive-native"