st/dri2: fix kms_swrast driconf option handling

st/dri2: fix kms_swrast driconf option handling

Commit e794f8bf8bdb ("gallium: move loading of drirc to pipe-loader")
moved the option cache to the pipe_loader_device. However, the
screen->dev pointer is not set when dri_init_options() is called. Move
the call to after the pipe_loader_sw_probe_kms() call so screen->dev is
set. This mirrors the code flow for dri2_init_screen().

Fixes: e794f8bf8bdb ("gallium: move loading of drirc to pipe-loader")
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Cc: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Rob Herring <robh@kernel.org>