[fuchsia] put ssh tools into shell commands

Change-Id: Ife3a1e53441885e523c81c435a37adf7bcc4286d
diff --git a/BUILD.gn b/BUILD.gn
index b40a16d..9fe7a59 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -5,8 +5,6 @@
 import("//build/package.gni")
 
 package("openssh-tools") {
-  deprecated_system_image = true
-
   deps = [
     ":scp",
     ":ssh",
@@ -16,12 +14,15 @@
   binaries = [
     {
       name = "scp"
+      shell = true
     },
     {
       name = "ssh"
+      shell = true
     },
     {
       name = "ssh-keygen"
+      shell = true
     },
   ]
 }