Revert "lz4 first tests"

This reverts commit a8b6f07fc6be3bcce0b073b96994a84241970c8b.

Conflicts:
	lib/Makefile
	lib/decompress_unlz4.c
	lib/lz4/lz4hc_compress.c
Revert "lz4 test2"

This reverts commit 3cbae02a4f37e4d6d389df3608a5ad1a1083be44.

Conflicts:
	lib/Makefile
Revert "lz4 nr3"

This reverts commit ad5a3c9fe11231424af6e1f09605ca876c55f9b3.
Revert "lz4 nr4"

This reverts commit 1df567d99e58a0078d8529aeb8a1ad6f28f9f62a.
Revert "lib/decompress_unlz4.c: always set an error return code on failures"

This reverts commit d60edf76fd3a6c6097c2d2a224215d6d97692c39.
Revert "initramfs: read CONFIG_RD_ variables for initramfs compression"

This reverts commit 04bd01871540090fdc4dc37d00f9e1ab538e36a2.
Revert "arm: add support for LZ4-compressed kernel"

This reverts commit 5fbce4df2c5c5db1bbd69cea2db52862d50a379f.