ARM: dts: sh73a0: Remove CMT renesas,channels-mask

Update the DTS to remove the now deprecated "renesas,channels-mask"
property.

The channel information is now kept in the device driver and can easily
be determined based on the compat string.

Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v3:
  - Take over from Magnus,
  - Split in per-SoC patches,

v2:
  - Rebased on top of power-domain changes,
  - Added Acked-by and Tested-by from Geert.
diff --git a/arch/arm/boot/dts/sh73a0.dtsi b/arch/arm/boot/dts/sh73a0.dtsi
index 88d7e56..914a7c2 100644
--- a/arch/arm/boot/dts/sh73a0.dtsi
+++ b/arch/arm/boot/dts/sh73a0.dtsi
@@ -100,9 +100,6 @@
 		clocks = <&mstp3_clks SH73A0_CLK_CMT1>;
 		clock-names = "fck";
 		power-domains = <&pd_c5>;
-
-		renesas,channels-mask = <0x3f>;
-
 		status = "disabled";
 	};