Update clang version to r510928

Bug: b/301328082
Change-Id: Ie3fd449d68ab690be6083144aad67c627021fa38
diff --git a/gbl/build.config.constants b/gbl/build.config.constants
index 370ff7d..0a9f1f5 100644
--- a/gbl/build.config.constants
+++ b/gbl/build.config.constants
@@ -1,2 +1,2 @@
 BRANCH=u-boot-mainline
-CLANG_VERSION=r475365b
+CLANG_VERSION=r510928