Skip libcronet dependency for riscv64.

There is no riscv64 prebuilt for cronet, skip the JNI library dependency
to avoid broken riscv64 builds.

Test: lunch aosp_riscv64-userdebug && m droid dist
Change-Id: I652fa9db48a71c036dba665db515f15d6014f162
diff --git a/Cronet/apex/Android.bp b/Cronet/apex/Android.bp
index 64362da..5f6fa3e 100644
--- a/Cronet/apex/Android.bp
+++ b/Cronet/apex/Android.bp
@@ -32,6 +32,12 @@
     name: "CronetApexDefaultsEnabled",
     jni_libs: ["libcronet.80.0.3986.0"],
     java_libs: ["framework-cronet"],
+    arch: {
+        riscv64: {
+	    // TODO: remove this when there is a riscv64 libcronet
+            exclude_jni_libs: ["libcronet.80.0.3986.0"],
+        },
+    },
 }
 
 apex_defaults {