Adds a new build task to run host_init_verifier on partition dirs.

Also includes passwd_system_ext in copy-init-script-file-checked,
seemingly left out as an oversight.

Bug: 163089173
Test: Treehugger build targets
Change-Id: I3b972e4677a6adad2c515f5762e0062803453d18
diff --git a/core/definitions.mk b/core/definitions.mk
index daac652..f659a34 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -2404,6 +2404,7 @@
 	$(1) \
 	$(HOST_INIT_VERIFIER) \
 	$(call intermediates-dir-for,ETC,passwd_system)/passwd_system \
+	$(call intermediates-dir-for,ETC,passwd_system_ext)/passwd_system_ext \
 	$(call intermediates-dir-for,ETC,passwd_vendor)/passwd_vendor \
 	$(call intermediates-dir-for,ETC,passwd_odm)/passwd_odm \
 	$(call intermediates-dir-for,ETC,passwd_product)/passwd_product \
@@ -2414,6 +2415,7 @@
 	$(call intermediates-dir-for,ETC,odm_property_contexts)/odm_property_contexts
 	$(hide) $(HOST_INIT_VERIFIER) \
 	  -p $(call intermediates-dir-for,ETC,passwd_system)/passwd_system \
+	  -p $(call intermediates-dir-for,ETC,passwd_system_ext)/passwd_system_ext \
 	  -p $(call intermediates-dir-for,ETC,passwd_vendor)/passwd_vendor \
 	  -p $(call intermediates-dir-for,ETC,passwd_odm)/passwd_odm \
 	  -p $(call intermediates-dir-for,ETC,passwd_product)/passwd_product \