treewide: fix board identifier in overlays for lpcxpresso55s69

Fix board identifier in overlays for the lpcxpresso55s69_cpu0 target.
Board identifiers were renamed with the following command:

for file in $(find . -name "lpcxpresso55s69_cpu0.*"); do;
	mv $file ${file/_cpu0/_lpc55s69_cpu0};
done

Additionally, remove lpcxpresso55s69_ns overlay targets where they are
no longer needed (or rename them where they are)

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>

boards/shields/mikroe_eth_click/boards/lpcxpresso55s69_ns.overlay

@@ -1,27 +0,0 @@
-/*
- * Copyright (C) 2020, NXP
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-/delete-node/ &eth_click;
-
-&mikrobus_spi {
-	status = "okay";
-
-	cs-gpios = <&gpio0 20 GPIO_ACTIVE_LOW>,
-		   <&gpio1 1 GPIO_ACTIVE_LOW>,
-		   <&gpio1 12 GPIO_ACTIVE_LOW>,
-		   <&gpio1 26 GPIO_ACTIVE_LOW>;
-
-	/* LPCXpresso55xxx boards all use SSEL1. */
-	eth_click_mikroe_eth_click: eth_click@1 {
-		compatible = "microchip,enc28j60";
-		reg = <0x1>;
-		full-duplex;
-		local-mac-address = [00 00 00 01 02 03];
-		/* Errata B7/1 specifies min 8Mhz, 20MHz max according to RM */
-		spi-max-frequency = <10000000>;
-		int-gpios = <&mikrobus_header 7 GPIO_ACTIVE_LOW>;	/* INT */
-	};
-};

tests/drivers/adc/adc_api/boards/lpcxpresso55s69_lpc55s69_cpu0_ns.overlay

@@ -1,36 +0,0 @@
-/*
- * SPDX-License-Identifier: Apache-2.0
- *
- * Copyright (c) 2023 Benjamin Björnsson <benjamin.bjornsson@gmail.com>
- */
-
-#include <zephyr/dt-bindings/adc/mcux-lpadc.h>
-
-/ {
-	zephyr,user {
-		io-channels = <&adc0 0>, <&adc0 4>;
-	};
-};
-
-&adc0 {
-	#address-cells = <1>;
-	#size-cells = <0>;
-
-	channel@0 {
-		reg = <0>;
-		zephyr,gain = "ADC_GAIN_1";
-		zephyr,reference = "ADC_REF_EXTERNAL0";
-		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
-		zephyr,resolution = <12>;
-                zephyr,input-positive = <MCUX_LPADC_CH0A>;
-	};
-
-	channel@4 {
-		reg = <4>;
-		zephyr,gain = "ADC_GAIN_1";
-		zephyr,reference = "ADC_REF_EXTERNAL0";
-		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
-		zephyr,resolution = <12>;
-                zephyr,input-positive = <MCUX_LPADC_CH1A>;
-	};
-};

tests/drivers/dma/loop_transfer/boards/lpcxpresso55s69_ns.overlay

@@ -1,7 +0,0 @@
-/*
- * Copyright (c) 2022 Kumar Gala <galak@kernel.org>
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-tst_dma0: &dma0 { };