drm/vmwgfx: Fix missing HYPERVISOR_GUEST dependency

VMWARE_HYPERCALL alternative will not work as intended without VMware guest code
initialization.

[ bp: note that this doesn't reproduce with newer gccs so it must be
something gcc-9-specific. ]

Closes: https://lore.kernel.org/oe-kbuild-all/[e-mail]/
Reported-by: kernel test robot <[e-mail]>
Signed-off-by: Alexey Makhalov <[e-mail]>
Signed-off-by: Borislav Petkov (AMD) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpu/drm/vmwgfx/Kconfig

···
 config DRM_VMWGFX
 	tristate "DRM driver for VMware Virtual GPU"
 	depends on DRM && PCI && MMU
-	depends on X86 || ARM64
+	depends on (X86 && HYPERVISOR_GUEST) || ARM64
 	select DRM_TTM
 	select DRM_TTM_HELPER
 	select MAPPING_DIRTY_HELPERS