Add gsid

The gsid is a daemon for managing GSI.

Bug: 122556707
Test: make && ls ${OUT}/bin/gsid
Change-Id: Ib4a3e95a7e232236ee1255a156043e45a77a3c8e
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 6e8e79b..378e47d 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -77,6 +77,7 @@
     fsck_msdos \
     fs_config_files_system \
     fs_config_dirs_system \
+    gsid \
     heapprofd \
     heapprofd_client \
     gatekeeperd \