drm/hyperv: Use fbdev-shmem

Implement fbdev emulation with fbdev-shmem. Avoids the overhead of
fbdev-generic's additional shadow buffering. No functional changes.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Deepak Rawat <drawat.floss@gmail.com>
Reviewed-by: Deepak Rawat <drawat.floss@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240419083331.7761-12-tzimmermann@suse.de

drivers/gpu/drm/hyperv/hyperv_drm_drv.c

@@ -11,7 +11,7 @@
 #include <drm/drm_aperture.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_drv.h>
-#include <drm/drm_fbdev_generic.h>
+#include <drm/drm_fbdev_shmem.h>
 #include <drm/drm_gem_shmem_helper.h>
 #include <drm/drm_simple_kms_helper.h>
 
@@ -149,7 +149,7 @@ static int hyperv_vmbus_probe(struct hv_device *hdev,
 		goto err_free_mmio;
 	}
 
-	drm_fbdev_generic_setup(dev, 0);
+	drm_fbdev_shmem_setup(dev, 0);
 
 	return 0;