Android: vulkan: fix build error due to extra )

Android: vulkan: fix build error due to extra )

Commit 621b3410f5f8 ("util/vulkan: Move Vulkan utilities to
src/vulkan/util") broke the Android build with the following error:

build/core/binary.mk:1427: error: external/mesa3d/src/vulkan/Android.mk: libmesa_vulkan_util: Unused source files: util/vk_util.h).

Fixes: 621b3410f5f8 ("util/vulkan: Move Vulkan utilities to src/vulkan/util")
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Cc: Alex Smith <asmith@feralinteractive.com>
Signed-off-by: Rob Herring <robh@kernel.org>