buildroot: bump to support RVV

mp-17 · mp-17 · commit 78819601b515 · 2025-06-04T17:55:55.000+02:00
diff --git a/buildroot b/buildroot
@@ -1 +1 @@
-Subproject commit aa433d1c5cfbd72b64ff3f92f2ffa2e02ea7089b
+Subproject commit 0473a9b521f13b56ee0745e7364e392e8740110b
