The panel-tpo-td028ttec1 driver incorrectly includes the OF vendor
prefix in its SPI alias. Fix it.

Fixes: 415b8dd0 ("drm/panel: Add driver for the Toppoly TD028TTEC1 panel")
Reported-by: NH. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191007170801.27647-5-laurent.pinchart@ideasonboard.comAcked-by: NSam Ravnborg <sam@ravnborg.org>
Reviewed-by: NSebastian Reichel <sebastian.reichel@collabora.com>
Tested-by: NH. Nikolaus Schaller <hns@goldelico.com>
Tested-by: NAndreas Kemnade <andreas@kemnade.info>