Revert "Enable KERNEL_MODE_NEON"

This reverts commit eee3e7c243f009b378e3de032f8c3c2404a75bd5.
Revert "lib/raid6: add ARM-NEON accelerated syndrome calculation"

This reverts commit 4e5fe2e6209d7b33d398392f2c8b135317b48dad.
Revert "ARM: crypto: add NEON accelerated XOR implementation"

This reverts commit 13fc8ec09346d1bd4c86c0559830a67cc5f285b8.
Revert "ARM: be strict about FP exceptions in kernel mode"

This reverts commit de39a27ce4ae0877459be03376e871291be62f3d.
Revert "ARM: move VFP init to an earlier boot stage"

This reverts commit 19e829e0f790ab773a5ca68881c79f147ccc6596.
Revert "ARM: add support for kernel mode NEON"

This reverts commit bf7888d1bd6ed0cbf439ab2b8209f992bdddb471.