Revert "enable lz4"

This reverts commit c3628046de0043895f3dece4bd00a413bd818d53.
Revert ".gitignore: ignore *.lz4 files"

This reverts commit da934f52c0d01a3e0cf7017aa8433f934419cc94.
Revert "arm: lz4: faster boot-up process."

This reverts commit ef863dd328d9a7417ffa54694dacccb5cb1d24c1.
Revert "lz4: fix compression/decompression signedness mismatch"

This reverts commit f3d9b1c3a4136cfbefa0163435b5061abccce342.
Revert "lib/lz4: correct the LZ4 license"

This reverts commit 6f602b09d9dc720b4ea311566f0d7585fa007773.
Revert "crypto: add lz4 Cryptographic API"

This reverts commit f7582916e772fddd30572376bbefc773a512dfdb.
Revert "lib: add lz4 compressor module"

This reverts commit 44bd236f6d45413cfdde05d1f4ff850ea281fc4b.
Revert "arm: add support for LZ4-compressed kernel"

This reverts commit 6173258517041136c9a3c0d668d4afdaed20ce53.
Revert "lib: add support for LZ4-compressed kernel"

This reverts commit b955dda2780fb2b6c5beb1e8fe39e83507ebe5cd.
Revert "decompressor: add LZ4 decompressor module"

This reverts commit f99da7178a83a19ef7faa6081ecd85f45f83b494.