Revert "use LZ4 compression"

This reverts commit ee48f6d4ce8d3de404def457c7ca79966db95b02.

Conflicts:
	arch/arm/configs/gk_tuna_defconfig
Revert "crypto-add-lz4-cryptographic-api-fix"

This reverts commit 56f1a21d3a2b10ca76cd95efe597aac81027f57d.
Revert "crypto: add lz4 Cryptographic API"

This reverts commit 5afc5f31d4c0c623813565d2d6b5445afe6faeb4.
Revert "lib-add-lz4-compressor-module-fix"

This reverts commit a1d7610252f262755f13df664e6b3e391d162c07.
Revert "lib: add lz4 compressor module"

This reverts commit e29a95ecd35168f6ca00cc4c42126c0d79388b2d.
Revert "arm: Remove enforced Os flag for LZ4 decompressor"

This reverts commit c2032e051219c981a7b5f6cab8d57a3733f678f0.
Revert "arm: add support for LZ4-compressed kernel"

This reverts commit 6c4b22cff9120b02daf20cd5818c18d18d8f7e40.
Revert "kbuild: fix for updated LZ4 tool with the new streaming format"

This reverts commit 0112df6415c548f9a8bd8a38b020cc031b638cbb.
Revert "lib: add support for LZ4-compressed kernel"

This reverts commit 6d6bb169d918126af9beb203385bc5a888fb545e.
Revert "decompressor: add LZ4 decompressor module"

This reverts commit e1b1bdd57b34eb4b6465ac33e3b84c7a5961e61f.