Revert "switch defconfig to LZ4"

This reverts commit e8aef180e6ac26aff6b927909a6f5e8a43749a58.
Revert "lz4: fix compression/decompression signedness mismatch"

This reverts commit 3316fa745b758fef7bf587af1067f3a7dd5a8501.
Revert "lib/lz4: correct the LZ4 license"

This reverts commit ce9cb5ea63578f8d8ced57d9e37a9f2cdd3dac9c.
Revert ".gitignore: ignore *.lz4 files"

This reverts commit 4b209d068c236bb5036aa2edb7c9395cb5f2f166.
Revert "crypto: add lz4 Cryptographic API"

This reverts commit e892a11a5cab4fd9ec9680fb25b0c380cae373d3.
Revert "lib: add lz4 compressor module"

This reverts commit ef481a43c2e09400db2fa37e3b0db2f86da6a995.
Revert "arm: add support for LZ4-compressed kernel"

This reverts commit c79711308d188cd90db9f58ea4e27d08d51dce78.
Revert "lib: add support for LZ4-compressed kernel"

This reverts commit 9122687f436b34fa3c04033f867f31d7bde0f99a.
Revert "decompressor: add LZ4 decompressor module"

This reverts commit 97d06abd760c08d0f14945ddf91316f9c22aa7d9.