drm/hisilicon/hibmc: Export VRAM MM information to debugfs

This change makes information about VRAM consumption available on
debugfs. See

/sys/kernel/debug/dri/0/vram-mm

for an overview of how VRAM is being used.

Signed-off-by: Thomas Zimmermann <[e-mail]>
Reviewed-by: Daniel Vetter <[e-mail]>
Acked-by: Sam Ravnborg <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c

···
 	.desc			= "hibmc drm driver",
 	.major			= 1,
 	.minor			= 0,
+	.debugfs_init		= drm_vram_mm_debugfs_init,
 	.dumb_create            = hibmc_dumb_create,
 	.dumb_map_offset        = drm_gem_vram_driver_dumb_mmap_offset,
 	.gem_prime_mmap		= drm_gem_prime_mmap,