r600g: Set geometry properties in r600_create_shader_state()

r600g: Set geometry properties in r600_create_shader_state()

The selector is shared by all shader variants, so the
individual shaders shouldn't change it. Use tgsi_shader_scan()
results to set geometry properties within a
r600_create_shader_state() call and treat said propertices in
the selector as read-only within r600_shader_from_tgsi().

Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Signed-off-by: Marek Olšák <marek.olsak@amd.com>