drm/xe: select X86_PLATFORM_DEVICES when ACPI_WMI is selected

ACPI_WMI is a subitem of X86_PLATFORM_DEVICES. And X86_PLATFORM_DEVICES
is not selected in the current Kconfig, and may cause Kconfig warnings:

WARNING: unmet direct dependencies detected for ACPI_WMI
  Depends on [n]: X86_PLATFORM_DEVICES [=n] && ACPI [=y]
  Selected by [m]:
  - DRM_XE [=m] && HAS_IOMEM [=y] && DRM [=m] && PCI [=y] && MMU [=y] &&
    (m && MODULES [=y] || y && KUNIT [=y]=y) && X86 [=y] && ACPI [=y]
Signed-off-by: Lu Yao <yaolu@kylinos.cn>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240415025215.15811-1-yaolu@kylinos.cnSigned-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

drivers/gpu/drm/xe/Kconfig

@@ -29,6 +29,7 @@ config DRM_XE
 	select INPUT if ACPI
 	select ACPI_VIDEO if X86 && ACPI
 	select ACPI_BUTTON if ACPI
+	select X86_PLATFORM_DEVICES if X86 && ACPI
 	select ACPI_WMI if X86 && ACPI
 	select SYNC_FILE
 	select IOSF_MBI