ARM: dts: remove STiH41x-b2020.dtsi

Since v4.8, STiH415/416 clock support has
been removed [1], these platform doesn't boot.
We can remove DTS files related to these socs.

[1] https://patchwork.kernel.org/patch/9157571/Signed-off-by: NPatrice Chotard <patrice.chotard@st.com>

arch/arm/boot/dts/stih41x-b2020.dtsi

-/*
- * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
- * Author: Srinivas Kandagatla <srinivas.kandagatla@st.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * publishhed by the Free Software Foundation.
- */
-#include "stih41x-b2020x.dtsi"
-#include <dt-bindings/gpio/gpio.h>
-/ {
-	memory{
-		device_type = "memory";
-		reg = <0x40000000 0x80000000>;
-	};
-
-	chosen {
-		bootargs = "console=ttyAS0,115200 clk_ignore_unused";
-		linux,stdout-path = &sbc_serial1;
-	};
-
-	aliases {
-		ttyAS0 = &sbc_serial1;
-		ethernet1 = &ethernet1;
-	};
-	soc {
-		sbc_serial1: serial@fe531000 {
-			status = "okay";
-		};
-
-		leds {
-			compatible	= "gpio-leds";
-			red {
-				label	= "Front Panel LED";
-				gpios	= <&pio4 1 GPIO_ACTIVE_HIGH>;
-				linux,default-trigger	= "heartbeat";
-			};
-			green {
-				gpios	= <&pio4 7 GPIO_ACTIVE_HIGH>;
-				default-state = "off";
-			};
-		};
-
-		i2c@fed40000 {
-			status = "okay";
-		};
-
-		/* HDMI Tx I2C */
-		i2c@fed41000 {
-			/* HDMI V1.3a supports Standard mode only */
-			clock-frequency = <100000>;
-			i2c-min-scl-pulse-width-us = <0>;
-			i2c-min-sda-pulse-width-us = <5>;
-
-			status = "okay";
-		};
-
-		i2c@fe540000 {
-			status = "okay";
-		};
-
-		i2c@fe541000 {
-			status = "okay";
-		};
-
-		ethernet1: dwmac@fef08000 {
-			status			= "okay";
-			phy-mode		= "rgmii-id";
-			max-speed		= <1000>;
-			st,tx-retime-src	= "clk_125";
-			snps,reset-gpio 	= <&pio3 0>;
-			snps,reset-active-low;
-			snps,reset-delays-us 	= <0 10000 10000>;
-
-			pinctrl-0	= <&pinctrl_rgmii1>;
-		};
-
-		mmc0: sdhci@fe81e000 {
-			bus-width = <8>;
-		};
-	};
-};