Add riscv64 sources to xnnpack_scalar_prod_microkernels am: 19256b9410 am: 4ae0f76833 am: 1099bf4fc2 am: 520b9e98fb am: 9436df4558

Original change: https://android-review.googlesource.com/c/platform/external/XNNPACK/+/2654249

Change-Id: I6a8140479a109b112c7982f693955971e118e714
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/Android.bp b/Android.bp
index 27f5d89..9dad715 100644
--- a/Android.bp
+++ b/Android.bp
@@ -8833,6 +8833,9 @@
         arm64: {
             srcs: PROD_SCALAR_AARCH32_MICROKERNEL_SRCS,
         },
+        riscv64: {
+            srcs: PROD_SCALAR_RISCV_MICROKERNEL_SRCS,
+        },
     },
     header_libs: [
         "fp16_headers",