Revert "ARM: only allow kernel mode neon with AEABI"

This reverts commit e6644eb5d3a22aa1ac79ae9c3406b566073d1652.
Revert "ARM: 7835/2: fix modular build of xor_blocks() with NEON enabled"

This reverts commit 0d3d82bc5117cc397a716d9e3be7a0f274bf4445.
Revert "ARM: crypto: add NEON accelerated XOR implementation"

This reverts commit 59656522f3a32ef2ccc9f014fa37062e37a93bab.
Revert "ARM: add support for kernel mode NEON"

This reverts commit b03751b08fe8218fa9edc0bf275eae38c40bfb97.