fs_config: add group to build

Setup PRODUCT_PACKAGES for the group file.

The group file is always included in the product
build but may be empty.

Test: That the group file is in the build.
Change-Id: I2ed1759fbe42a7e6833bb754b00cadaf949f128d
Signed-off-by: William Roberts <william.c.roberts@intel.com>
diff --git a/target/product/embedded.mk b/target/product/embedded.mk
index 05ebeec..690297e 100644
--- a/target/product/embedded.mk
+++ b/target/product/embedded.mk
@@ -88,9 +88,10 @@
     service_contexts
 
 # AID Generation for
-# <pwd.h> and friends.
+# <pwd.h> and <grp.h>
 PRODUCT_PACKAGES += \
-    passwd
+    passwd \
+    group
 
 # Ensure that this property is always defined so that bionic_systrace.cpp
 # can rely on it being initially set by init.