pruning broken board

Signed-off-by: Ronald G Minnich <rminnich@gmail.com>

mainboards/sunxi/nezha/.gitignore

@@ -1,5 +0,0 @@
-cpu.cpio
-cpu.cpio.*
-linux/
-cpukernel
-

mainboards/sunxi/nezha/Makefile

@@ -1,54 +0,0 @@
-# This is the makefile for a cpu kernel and initramfs
-# to be used on a rvboards d1
-#
-# The cpu image uses a cpud as its init, and you
-# can cpu to it to run commands.
-
-default: cpukernel
-
-cpukernel: cpu.cpio.xz cpu.config
-	cp cpu.config linux/.config
-	(cd linux && CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv make oldconfig && CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv make -j32)
-	cp linux/arch/riscv/boot/Image cpukernel
-	cp linux/arch/riscv/boot/dts/allwinner/sun20i-d1-nezha.dtb .
-
-# this target builds an initramfs with cpud as init, and the core
-# set of u-root commands.
-# It depends on the kernel setting the IP address.
-# You need ip=dhcp OR ip=fixed.ip.address.here in the command line
-cpu.cpio: Makefile
-	GOARCH=riscv64 CGO_ENABLED=0 u-root -o cpu.cpio -build=bb -files ~/.ssh/cpu_rsa.pub:key.pub \
-		    -uroot-source $(HOME)/go/src/github.com/u-root/u-root \
-		core \
-		$(HOME)/go/src/github.com/u-root/cpu/cmds/cpud
-
-cpu.cpio.xz: cpu.cpio
-	xz --check=crc32 -9 --lzma2=dict=1MiB --stdout cpu.cpio | dd conv=sync bs=512 of=cpu.cpio.xz
-
-# These stanzas fetch code.
-fetch: getkernel geturoot
-
-getkernel:
-	rm -rf linux
-	git clone --depth=1 -b v5.15.5-openwrt --single-branch https://github.com/orangecms/linux
-
-geturoot:
-	GO111MODULE=off go get -u github.com/u-root/u-root
-	GO111MODULE=off go get -u github.com/u-root/cpu/...
-
-# Serve the combined sshd-kernel and sshd-initramfs image. This includes flashrom
-sshd-pxeserver:
-	echo Consider Disabling any system services ...
-	echo e.g. sudo systemctl  stop tftpd-hpa.service
-	echo e.g. sudo systemctl stop isc-dhcp-server
-	sudo `go env GOPATH`/bin/pxeserver  -tftp-dir . -bootfilename sshdkernel  -http-dir . -interface $(NETWORK)
-
-# Serve the combined cpu-kernel and cpu-initramfs image.
-cpu-pxeserver:
-	echo Consider Disabling any system services ...
-	echo e.g. sudo systemctl  stop tftpd-hpa.service
-	echo e.g. sudo systemctl stop isc-dhcp-server
-	sudo `go env GOPATH`/bin/pxeserver  -tftp-dir . -bootfilename cpukernel  -http-dir . -interface $(NETWORK)
-
-ssh:
-	ssh -i class_key -p 2022 root@up