clk: renesas: cpg-mssr: add R8A77980 support

Add R-Car V3H (R8A77980) Clock Pulse Generator / Module Standby and
Software Reset support,  using the CPG/MSSR driver core and the common
R-Car Gen3 code.

Based on the original (and large) patch by Vladimir Barinov.

Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/clk/renesas/renesas-cpg-mssr.c

@@ -699,6 +699,12 @@ static const struct of_device_id cpg_mssr_match[] = {
 		.data = &r8a77970_cpg_mssr_info,
 	},
 #endif
+#ifdef CONFIG_ARCH_R8A77980
+	{
+		.compatible = "renesas,r8a77980-cpg-mssr",
+		.data = &r8a77980_cpg_mssr_info,
+	},
+#endif
 #ifdef CONFIG_CLK_R8A77995
 	{
 		.compatible = "renesas,r8a77995-cpg-mssr",