Revert "cleaning"

This reverts commit f0f9fea0e1e162f2fd8ddeb382c2de283a9e34b4.
Revert "arm: add support for LZ4-compressed kernel"

This reverts commit 3c3fd90e806b460f4a7fd10888123ad1d6fa1d0f.
Revert "decompressor: add LZ4 decompressor module"

This reverts commit fcda8ef173b22df967372a3a2ee1208cb187fedb.