Update clang to r328903

Bug: http://b/77532044

* b/77967848 - Disable -Wc++98-compat-extra-semi

Test: Test various targets in AOSP and internal branches.  For Googlers,
go/clang-r328903-testing

Change-Id: If08dafb9ad993fb686dfd6eeb5e2d61a9c99bd0b
diff --git a/cc/config/global.go b/cc/config/global.go
index d998ca2..06f6f9a 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -124,8 +124,8 @@
 
 	// prebuilts/clang default settings.
 	ClangDefaultBase         = "prebuilts/clang/host"
-	ClangDefaultVersion      = "clang-4679922"
-	ClangDefaultShortVersion = "7.0.1"
+	ClangDefaultVersion      = "clang-r328903"
+	ClangDefaultShortVersion = "7.0.2"
 
 	// Directories with warnings from Android.bp files.
 	WarningAllowedProjects = []string{