Add installd to PRODUCT_PACKAGES

Another change adds the "optional" tag to installd, so moving it here
and removing it from the grandfathered list.

Change-Id: I035ffd527d007cf104c15890509976fc9b99d216

core/user_tags.mk

@@ -153,7 +153,6 @@ GRANDFATHERED_USER_MODULES += \
 	ime \
 	init \
 	input \
-	installd \
 	ip \
 	iptables \
 	iself \

target/product/core.mk

@@ -41,6 +41,7 @@ PRODUCT_PACKAGES := \
     framework-res \
     hprof-conv \
     icu.dat \
+    installd \
     ip-up-vpn \
     jasmin \
     jasmin.jar \