3rdparty/libhwbase: Update submodule pointer

Update libhwbase to the current master. Some noteworthy changes:

* Add prerequisites for upcoming Apollo Lake support in libgfxinit.
* Add some support for Linux user-space for libgfxinit's `gfx_test`.
* Fix compilation with GCC 7.

Change-Id: If3c65065ef9a2ff6fce221939fda43c9e30c1eb8
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/20090
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/3rdparty/libhwbase b/3rdparty/libhwbase
index aab715f..3bf6759 160000
--- a/3rdparty/libhwbase
+++ b/3rdparty/libhwbase
@@ -1 +1 @@
-Subproject commit aab715f166bf1b54cfbd6982e8df49248ea544d8
+Subproject commit 3bf6759dc09d27c06b3533fd536e667356853d3d