ARM: dts: R-Car Gen1 board comment update

Include R-Car Gen1 product names for Bock-W and Marzen.

The product names are taken from:
Documentation/devicetree/bindings/arm/shmobile.txt
Signed-off-by: Magnus Damm <damm@opensource.se>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7778-bockw.dts

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Reference Device Tree Source for the Bock-W board
+ * Reference Device Tree Source for the R-Car M1A (R8A77781) Bock-W board
  *
  * Copyright (C) 2013  Renesas Solutions Corp.
  * Copyright (C) 2013  Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

arch/arm/boot/dts/r8a7779-marzen.dts

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Device Tree Source for the Marzen board
+ * Device Tree Source for the R-Car H1 (R8A77790) Marzen board
  *
  * Copyright (C) 2013 Renesas Solutions Corp.
  * Copyright (C) 2013 Simon Horman