Revert "ARM: move VFP init to an earlier boot stage"

This reverts commit 50c06c19f3de938083494b69560e0742ea4e9a20.
Revert "ARM: only allow kernel mode neon with AEABI"

This reverts commit ca28a490149b31e8562338046ac4e494b07ac986.
Revert "ARM: 7835/2: fix modular build of xor_blocks() with NEON enabled"

This reverts commit 054fadb9e87094fb4fb29e7c01c4a71184f197c6.
Revert "ARM: add support for kernel mode NEON"

This reverts commit 51dc52744730e567c3c5b6878f5c4d64291b9437.