ARM: rmobile: Identify R-Car M3-W R8A7796 r1.1/1.2 SoC

r8a7796 cpu revision v1.2 has the same information as revision v1.1.
This patch fixes revision display at startup to "rev 1.1/1.2".

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
[Marek: Slight update to commit message, spell out the SoC model]