Rename soong_jar to soong_zip

This is a general purpose tool that happens to contain some jar specific
features.

Change-Id: I05f4654d4517c245ad7a3c15492e0d2368bbf64f
diff --git a/Android.bp b/Android.bp
index e287dab..eb70cc1 100644
--- a/Android.bp
+++ b/Android.bp
@@ -205,11 +205,11 @@
 }
 
 blueprint_go_binary {
-    name: "soong_jar",
+    name: "soong_zip",
     deps: ["android-archive-zip"],
     srcs: [
-        "cmd/soong_jar/soong_jar.go",
-        "cmd/soong_jar/rate_limit.go",
+        "cmd/soong_zip/soong_zip.go",
+        "cmd/soong_zip/rate_limit.go",
     ],
 }