panfrost: Add the shader BO to the batch in patch_shader_state()

panfrost: Add the shader BO to the batch in patch_shader_state()

We know a shader will be used by a batch when
panfrost_patch_shader_state() is called, so let's add the shader BO at
that time.

Suggested-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>