vga_switcheroo: fix build on platforms with no ACPI

radeon was always including the atpx code unnecessarily, also core
switcheroo was including acpi headers.

Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/vga/vga_switcheroo.c

@@ -25,9 +25,6 @@
 #include <linux/debugfs.h>
 #include <linux/fb.h>
 
-#include <acpi/acpi.h>
-#include <acpi/acpi_bus.h>
-
 #include <linux/pci.h>
 #include <linux/vga_switcheroo.h>