svga: enable PIPE_CAP_IMAGE_STORE_FORMATTED on gl43 capable device
With upstream mesa PIPE_CAP_IMAGE_STORE_FORMATTED needs to be set to enable ARB_shader_image_load_store extension. This will reenable GL43 support for svga GL43 capable device
Fixes: 3b81d2d3 ('mesa/st: do not expose ARB_shader_image_load_store if not fully implemented')
Tested with glretrace
Reviewed-by: Charmaine Lee charmainel@vmware.com