chrony: use inherit_defer for conditional inherit of useradd

conditionnal inherit is missed when PACKAGECONFIG privdrop is
activated after this inherit, eg in .bbappend.

Signed-off-by: Andreas Fenkart <afenkart@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-networking/recipes-support/chrony/chrony_4.6.1.bb

@@ -48,7 +48,7 @@ DEPENDS = "pps-tools"
 inherit update-rc.d systemd pkgconfig
 
 # Add chronyd user if privdrop packageconfig is selected
-inherit ${@bb.utils.contains('PACKAGECONFIG', 'privdrop', 'useradd', '', d)}
+inherit_defer ${@bb.utils.contains('PACKAGECONFIG', 'privdrop', 'useradd', '', d)}
 USERADD_PACKAGES = "${@bb.utils.contains('PACKAGECONFIG', 'privdrop', '${PN}', '', d)}"
 USERADD_PARAM:${PN} += "${@bb.utils.contains('PACKAGECONFIG', 'privdrop', '--system -d / -M --shell /sbin/nologin chronyd;', '', d)}"