lima: handle fp16 vertex formats

lima: handle fp16 vertex formats

12128fb1351e marked fp16 vertex formats supported, but they aren't actually handled
by lima_pipe_format_to_attrib_type(). Fix it by handling it there.
FP16 seems to be the only missing index which is 0x3.

Fixes: 12128fb1351e ("lima: add natively supported vertex buffer formats")

Cc: 21.1 mesa-stable
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11872>