drm/rockchip: vop: fix repeated words in comment

Delete the redundant word 'in'.
Signed-off-by: wangjianli <wangjianli@cdjrlc.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220908123616.19195-1-wangjianli@cdjrlc.com

drivers/gpu/drm/rockchip/rockchip_drm_vop.c

@@ -1188,7 +1188,7 @@ static bool vop_crtc_mode_fixup(struct drm_crtc *crtc,
 	 *
 	 * Key points:
 	 *
-	 * - DRM works in in kHz.
+	 * - DRM works in kHz.
 	 * - Clock framework works in Hz.
 	 * - Rockchip's clock driver picks the clock rate that is the
 	 *   same _OR LOWER_ than the one requested.