trusty: Add vendor variant of libtrusty_coverage

We want to add coverage statistics to the trusty-ut-ctrl tool, which is
a vendor binary. Thus we need a vendor variant of libtrusty_coverage.
Merges system libtrusty_test and vendor libtrusty into a single
vendor_available library so that we can add vendor_available to
libtrusty_coverage and make it accessible from vendor tools.

Bug: 175221942
Test: make libtrusty_coverage
Change-Id: I68cc8f1c1580bda8591dbe744e9751474811576d
diff --git a/trusty/fuzz/Android.bp b/trusty/fuzz/Android.bp
index 4df77af..ad13816 100644
--- a/trusty/fuzz/Android.bp
+++ b/trusty/fuzz/Android.bp
@@ -39,7 +39,7 @@
     export_include_dirs: ["include"],
     static_libs: [
         "libFuzzer",
-        "libtrusty_test",
+        "libtrusty",
     ],
     shared_libs: [
         "libtrusty_coverage",