3rdparty/libhwbase: Update submodule pointer

Pull a minor update for GCC 8 compatibility.

Change-Id: I0a4af47d56f3ca0b8ed82533e84c44041661ca35
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/26306
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/3rdparty/libhwbase b/3rdparty/libhwbase
index 6685971..637f2a4 160000
--- a/3rdparty/libhwbase
+++ b/3rdparty/libhwbase
@@ -1 +1 @@
-Subproject commit 66859712e4817288591908d737dbf41ddea31c3a
+Subproject commit 637f2a4f21ead8ccc45d5256834eb27ce72088db