make descrambler test optional since it may be provided through tuner module since cas@1.2

bug: 176799453
Test: Manual
Change-Id: Iffbd76723c53ba0d94ccfcbd8c22beb1d8173fad
diff --git a/cas/1.1/vts/functional/Android.bp b/cas/1.1/vts/functional/Android.bp
index de223c8..0647d12a 100644
--- a/cas/1.1/vts/functional/Android.bp
+++ b/cas/1.1/vts/functional/Android.bp
@@ -21,6 +21,7 @@
     static_libs: [
         "android.hardware.cas@1.0",
         "android.hardware.cas@1.1",
+        "android.hardware.cas@1.2",
         "android.hardware.cas.native@1.0",
         "android.hidl.allocator@1.0",
         "android.hidl.memory@1.0",