modetest: Make modetest availble to vendor on Android

Make modetest available to vendors on Android. libdrm_util and
libdrm_test_headers is also made available to vendors since these are
depenencies of modetest. This results in the module target
modetest.vendor being availble to vendor modules.

Signed-off-by: Rob Barnes <robbarnes at google.com>

tests/Android.bp

@@ -3,4 +3,5 @@ subdirs = ["*"]
 cc_library_headers {
     name: "libdrm_test_headers",
     export_include_dirs: ["."],
+    vendor_available: true,
 }

tests/modetest/Android.bp

@@ -9,4 +9,5 @@ cc_binary {
 
     shared_libs: ["libdrm"],
     static_libs: ["libdrm_util"],
+    vendor_available: true,
 }

tests/util/Android.bp

@@ -32,4 +32,5 @@ cc_library_static {
     shared_libs: ["libdrm"],
     header_libs: ["libdrm_test_headers"],
     export_header_lib_headers: ["libdrm_test_headers"],
+    vendor_available: true,
 }