Use kotlin libraries from external/kotlinc

Soong will add kotlin-stdlib from external/kotlinc to modules
with .kt sources.  Use kotlin-reflect from there too instead of
from the maven prebuilts.

Bug: 78245848
Test: m metalava
Change-Id: I3da921667a05d680ccb0b486e9271e54e128fe2a
diff --git a/Android.bp b/Android.bp
index 17eb578..c58dc68 100644
--- a/Android.bp
+++ b/Android.bp
@@ -20,6 +20,7 @@
     ],
     java_resources: ["src/main/resources/**/*"],
     static_libs: [
+        "kotlin-reflect",
         "metalava-tools-common-m2-deps",
         "metalava-gradle-plugin-deps",
     ],