Fix licenses and license texts.

Use Android-Apache-2.0 for all Apache 2.0

Remove legacy_restricted (no longer appears in code).

Remove Android.bp which did not build anything but was a placeholder
for the missing license texts.

Test: m nothing
Change-Id: Ia491a59c735ca20afda9b4bbac9d8b33dbf8874e

tools/libhost/Android.bp

@@ -1,10 +1,6 @@
 package {
     // See: http://go/android-license-faq
-    // A large-scale-change added 'default_applicable_licenses' to import
-    // all of the 'license_kinds' from "build_make_license"
-    // to get the below license kinds:
-    //   legacy_restricted
-    default_applicable_licenses: ["build_make_license"],
+    default_applicable_licenses: ["Android-Apache-2.0"],
 }
 
 cc_library_host_static {