Revert "Enable LZ4 in defconfig."

This reverts commit a11f57c16b01e0390dd58ae8eb6e0db04bc78759.
Revert "lib: Add lz4 compressor module"

This reverts commit 88bfe5bffd2d3465e68442187e24af6fc9a61533.
Revert "arm: Add support for LZ4-compressed kernel"

This reverts commit 278b0afbd82f1aad98ca8289815202f4f3f3d93b.
Revert "lib: Add support for LZ4-compressed kernel"

This reverts commit a80d899c157e9ecaee01241f072763fa2ca3e711.
Revert "xdecompressor: Add LZ4 decompressor module"

This reverts commit 1cf50c7fb4505b2e8acab3137577fde92f5f443a.