drm/radeon: Drop unnecessary #include <linux/vga_switcheroo.h>

This was added to three files even though they don't use any
vga_switcheroo symbols:

Added to radeon_acpi.c by commit d7a2952f1ade ("drm/radeon: Add
support for the ATIF ACPI method to the radeon driver").

Added to radeon_asic.c by commit 0a10c85129c2 ("drm/radeon: create
radeon_asic.c").

Added to radeon_bios.c by commit 6a9ee8af344e ("vga_switcheroo:
initial implementation (v15)").

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_acpi.c

@@ -25,7 +25,6 @@
 #include <linux/acpi.h>
 #include <linux/slab.h>
 #include <linux/power_supply.h>
-#include <linux/vga_switcheroo.h>
 #include <acpi/video.h>
 #include <drm/drmP.h>
 #include <drm/drm_crtc_helper.h>

drivers/gpu/drm/radeon/radeon_asic.c

@@ -31,7 +31,6 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/radeon_drm.h>
 #include <linux/vgaarb.h>
-#include <linux/vga_switcheroo.h>
 #include "radeon_reg.h"
 #include "radeon.h"
 #include "radeon_asic.h"

drivers/gpu/drm/radeon/radeon_bios.c

@@ -30,7 +30,6 @@
 #include "radeon.h"
 #include "atom.h"
 
-#include <linux/vga_switcheroo.h>
 #include <linux/slab.h>
 #include <linux/acpi.h>
 /*