Revert "lib/decompress_unlz4.c: always set an error return code on failures"

This reverts commit 39eeba5bbe4c2dff1685b8910701a65a97440ca5.
Revert "arm: lz4: faster boot-up process."

This reverts commit f51ee74caa8675780deb6dae57c1dffd1e64b07b.
Revert "lz4: fix compression/decompression signedness mismatch"

This reverts commit 499d9a15d9bcd443bb3099f6f9503bfd874573a0.
Revert "lib/lz4: correct the LZ4 license"

This reverts commit ffb6332429a7b77b3e47a87201f6ec764c5ef817.
Revert "crypto: add lz4 Cryptographic API"

This reverts commit d7260f48d7c54c6c8188d1acb0b9cdd8718c44f8.
Revert "lib: add lz4 compressor module"

This reverts commit a740a7febca454e6e293fd5ad29122e2ea196e0d.
Revert "arm: add support for LZ4-compressed kernel"

This reverts commit cdc8eec6826db126dbbff3466538aa9b50a047e6.
Revert "lib: add support for LZ4-compressed kernel"

This reverts commit 4608277964b301aaff4c69f87c17af33813b7bdd.
Revert "decompressor: add LZ4 decompressor module"

This reverts commit 38240073eb66de67b17a51cde9ee82b47030f5e0.