configs/rock_pi_n8: remove defconfig, broken

This defconfig no longer builds:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/11026769867

It has been broken for at least 2 months:

  https://gitlab.com/buildroot.org/buildroot/-/jobs?name=T%3Drock_pi_n8&kind=BUILD

This defconfig was maintained by Suniel Mahesh, but his e-mail at
Amarula is bouncing, so basically this defconfig is unmaintained.

Unless a fix is provided, this defconfig will be removed.

Fixes:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/11026769867

Cc: Adam Duskett <adam.duskett@amarulasolutions.com>
Cc: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Cc: Jagan Teki <jagan@amarulasolutions.com>
Cc: Meena Murthy <meena.murthy@amarulasolutions.com>
Cc: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Arnout Vandecappelle <arnout@rnout.be>

board/radxa/rockpi-n8/extlinux.conf

@@ -1,4 +0,0 @@
-label RK3288_ROCKPI_N8 linux
-  kernel /zImage
-  devicetree /rk3288-rock-pi-n8.dtb
-  append console=ttyS2,115200n8 root=/dev/mmcblk0p4 rw rootwait

board/radxa/rockpi-n8/genimage.cfg

@@ -1,39 +0,0 @@
-image boot.vfat {
-	vfat {
-		files = {
-			"zImage",
-			"rk3288-rock-pi-n8.dtb",
-			"extlinux"
-		}
-	}
-
-	size = 16M
-}
-
-image sdcard.img {
-	hdimage {
-		partition-table-type = "gpt"
-	}
-
-	partition loader1 {
-		image = "idbloader.img"
-		offset = 32K
-	}
-
-	partition loader2 {
-		image = "u-boot-dtb.img"
-		offset = 8M
-	}
-
-	partition boot {
-		partition-type-uuid = F
-		bootable = "true"
-		image = "boot.vfat"
-		offset = 16M
-	}
-
-	partition rootfs {
-		partition-type-uuid = 69dad710-2ce4-4e3c-b16c-21a1d49abed3
-		image = "rootfs.ext4"
-	}
-}

board/radxa/rockpi-n8/post-build.sh

@@ -1,5 +0,0 @@
-#!/bin/sh
-
-BOARD_DIR="$(dirname $0)"
-
-install -m 0644 -D $BOARD_DIR/extlinux.conf $BINARIES_DIR/extlinux/extlinux.conf

board/radxa/rockpi-n8/readme.txt

@@ -1,61 +0,0 @@
-RADXA ROCKPI-N8
-================
-https://wiki.radxa.com/RockpiN8
-
-Build:
-======
-  $ make rock_pi_n8_defconfig
-  $ make
-
-Files created in output directory
-=================================
-
-output/images
-.
-├── boot.vfat
-├── extlinux
-├── idbloader.img
-├── rk3288-rock-pi-n8.dtb
-├── rootfs.ext2
-├── rootfs.ext4 -> rootfs.ext2
-├── rootfs.tar
-├── sdcard.img
-├── u-boot.bin
-├── u-boot-dtb.bin
-├── u-boot-dtb.img
-└── zImage
-
-Creating bootable SD card:
-==========================
-
-Simply invoke (as root)
-
-sudo dd if=output/images/sdcard.img of=/dev/sdX && sync
-
-Where X is your SD card device.
-
-Booting:
-========
-
-Serial console:
----------------
-RockPi-N8 has a 40-pin GPIO header. The pin layout is as follows:
-
-pin 6:  gnd
-pin 8:  tx
-pin 10: rx
-
-Baudrate for this board is 115200.
-
-The boot order on rockpi-n8 is emmc, sd. If emmc contains a valid Image, the board
-always boots from emmc. To boot from SD, erase emmc as per the guide:
-
-https://wiki.amarulasolutions.com/bsp/setup/rockchip/rk3399_emmc.html
-
-Login:
-------
-Enter 'root' as login user, and the prompt is ready.
-
-wiki link:
-----------
-https://wiki.amarulasolutions.com/bsp/rockchip/rk3288/rock-pi-n8.html