drm/i915: quirk backlight present on Macbook 4, 1

Unsurprisingly macbooks have backlights, just the VBT doesn't seem to
know it in this case.
Reported-and-tested-by: NDaniel Nicoletti <dantti12@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=88325
Fixes: c675949e ("drm/i915: do not setup backlight if not available according to VBT")
Cc: stable@vger.kernel.org # v3.15+
Reviewed-by: NAnder Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1446716999-1796-1-git-send-email-jani.nikula@intel.com

drivers/gpu/drm/i915/intel_display.c

@@ -14707,6 +14707,9 @@ static struct intel_quirk intel_quirks[] = {
 	/* Apple Macbook 2,1 (Core 2 T7400) */
 	{ 0x27a2, 0x8086, 0x7270, quirk_backlight_present },
 
+	/* Apple Macbook 4,1 */
+	{ 0x2a02, 0x106b, 0x00a1, quirk_backlight_present },
+
 	/* Toshiba CB35 Chromebook (Celeron 2955U) */
 	{ 0x0a06, 0x1179, 0x0a88, quirk_backlight_present },