platform/x86: apple-gmux: Stop calling acpi/video.h functions

Now that acpi_video_get_backlight_type() has apple-gmux detection (using
apple_gmux_present()), it is no longer necessary for the apple-gmux code
to manually remove possibly conflicting drivers.

So remove the handling for this from the apple-gmux driver.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/apple-gmux.c

@@ -21,7 +21,6 @@
 #include <linux/delay.h>
 #include <linux/pci.h>
 #include <linux/vga_switcheroo.h>
-#include <acpi/video.h>
 #include <asm/io.h>
 
 /**
@@ -694,7 +693,6 @@ static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
 	 * backlight control and supports more levels than other options.
 	 * Disable the other backlight choices.
 	 */
-	acpi_video_set_dmi_backlight_type(acpi_backlight_vendor);
 	apple_bl_unregister();
 
 	gmux_data->power_state = VGA_SWITCHEROO_ON;
@@ -804,7 +802,6 @@ static void gmux_remove(struct pnp_dev *pnp)
 	apple_gmux_data = NULL;
 	kfree(gmux_data);
 
-	acpi_video_register();
 	apple_bl_register();
 }