[backend] Fix src in wrong target

Bug: 291126189
Test: mm and berberis_host_tests
Change-Id: I6888de9587b0d2c0326021d17bc4d8d4b5064de8
diff --git a/backend/Android.bp b/backend/Android.bp
index 084d556..5ccce90 100644
--- a/backend/Android.bp
+++ b/backend/Android.bp
@@ -218,6 +218,9 @@
     header_libs: [
         "libberberis_backend_headers_riscv64_to_x86_64",
     ],
+    srcs: [
+        "riscv64_to_x86_64/code_gen.cc",
+    ],
 }
 
 cc_library_headers {
@@ -278,7 +281,4 @@
     shared: {
         enabled: false,
     },
-    srcs: [
-        "riscv64_to_x86_64/code_gen.cc",
-    ],
 }