We have Vulkan utilities in both src/util and src/vulkan/util. The
latter seems a more appropriate place for Vulkan-specific things, so
move them there.
v2: Android build system changes (from Tapani Pälli)
Signed-off-by: Alex Smith <email@example.com>
Reviewed-by: Emil Velikov <firstname.lastname@example.org>
Reviewed-by: Eric Engestrom <email@example.com>
Acked-by: Jason Ekstrand <firstname.lastname@example.org>