Revert "src/Kconfig: Don't treat warns as errors on Clang builds yet"

This reverts commit 9b63c9bde2fc3b3a2d42e68618e043cf282bc566.

Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Change-Id: I4f547d20c5096877b2010602a087e41702939f77
Reviewed-on: http://review.coreboot.org/7506
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)
diff --git a/src/Kconfig b/src/Kconfig
index 7b52589..0fb88da 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -1122,13 +1122,9 @@
 	bool
 	default n
 
-# XXX Currently clang/llvm builds are not fully supported,
-# Let us tone down warns treated as errors until we actually build
-# the whole treee.
 config WARNINGS_ARE_ERRORS
 	bool
-	default y if !COMPILER_LLVM_CLANG
-	default n if COMPILER_LLVM_CLANG
+	default y
 
 # The four POWER_BUTTON_DEFAULT_ENABLE, POWER_BUTTON_DEFAULT_DISABLE,
 # POWER_BUTTON_FORCE_ENABLE and POWER_BUTTON_FORCE_DISABLE options are