drm/nouveau/bl: Assign different names to interfaces

Currently, every backlight interface created by Nouveau uses the same name,
nv_backlight. This leads to a sysfs warning as it tries to create an already
existing folder. This patch adds a incremented number to the name, but keeps
the initial name as nv_backlight, to avoid possibly breaking userspace; the
second interface will be named nv_backlight1, and so on.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=86539

v2:
* Switch to using ida for generating unique IDs, as suggested by Ilia Mirkin;
* Allocate backlight name on the stack, as suggested by Ilia Mirkin;
* Move `nouveau_get_backlight_name()` to avoid forward declaration, as
  suggested by Ilia Mirkin;
* Fix reference to bug report formatting, as reported by Nick Tenney.

v3:
* Define a macro for the size of the backlight name, to avoid defining
  it multiple times;
* Use snprintf in place of sprintf.

v4:
* Do not create similarly named interfaces when reaching the maximum
  amount of unique names, but fail instead, as pointed out by Lukas Wunner

Signed-off-by: Pierre Moreau <pierre.morrow@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_drm.c

@@ -1122,6 +1122,7 @@ nouveau_drm_init(void)
 #endif
 
 	nouveau_register_dsm_handler();
+	nouveau_backlight_ctor();
 	return drm_pci_init(&driver_pci, &nouveau_drm_pci_driver);
 }
 
@@ -1132,6 +1133,7 @@ nouveau_drm_exit(void)
 		return;
 
 	drm_pci_exit(&driver_pci, &nouveau_drm_pci_driver);
+	nouveau_backlight_dtor();
 	nouveau_unregister_dsm_handler();
 
 #ifdef CONFIG_NOUVEAU_PLATFORM_DRIVER