soc: renesas: Identify R-Car M3-W ES1.1

The Product Register of R-Car M3-W ES1.1 incorrectly identifies the SoC
revision as ES2.0.  Add a workaround to fix this.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>