loader: remove loader_get_driver_for_fd() driver_type

Reminiscent from the pre-loader days, were we had multiple instances of
the loader logic in separate places and one could build a "GALLIUM_ONLY"
version.

Since that is no longer the case and the loaders (glx/egl/gbm) do not
(and should not) require to know any classic/gallium specific we can
drop the argument and the related code.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Axel Davy <axel.davy@ens.fr>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/loader/loader.h

@@ -33,9 +33,6 @@ extern "C" {
 
 /* Helpers to figure out driver and device name, eg. from pci-id, etc. */
 
-#define _LOADER_DRI          (1 << 0)
-#define _LOADER_GALLIUM      (1 << 1)
-
 int
 loader_open_device(const char *);
 
@@ -43,7 +40,7 @@ int
 loader_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id);
 
 char *
-loader_get_driver_for_fd(int fd, unsigned driver_types);
+loader_get_driver_for_fd(int fd);
 
 char *
 loader_get_device_name_for_fd(int fd);