Replace no_framework_libs: true with sdk_version: "core_platform"

Bug: 134566750
Test: m
Change-Id: Idb8e6c497b6caf972bec9cfdd23055730325a33c
Merged-In: I0260942108a13cc5e9bed1d6005abfb8daffe0ac
Exempt-From-Owner-Approval: minor build change
diff --git a/proto/Android.bp b/proto/Android.bp
index 5523c53..ad4e04c 100644
--- a/proto/Android.bp
+++ b/proto/Android.bp
@@ -5,7 +5,7 @@
         type: "nano",
     },
     srcs: ["src/**/*.proto"],
-    no_framework_libs: true,
+    sdk_version: "core_platform",
     // Pin java_version until jarjar is certified to support later versions. http://b/72703434
     java_version: "1.8",
     target: {