Revert "ARM: update FIQ support for relocation of vectors"

This reverts commit 19b763e34903393933f009167bcdec66e002428e.
Revert "ARM: fiq: change FIQ_START to a variable"

This reverts commit cb42a2d83f340fba1adc6f2b7e316181fe627187.
Revert "ARM: move vector stubs"

This reverts commit 47dcfc208d4da5d77e0c20f25a060630fc7d905b.

Conflicts:

	arch/arm/mm/mmu.c

Change-Id: I71c43b5b790dc7d91d91fb0e1fd93b7abac604da
Revert "ARM: poison memory between kuser helpers"

This reverts commit cdd38b3c3a79783dc5a1e84abab69180b2628188.
Revert "ARM: poison the vectors page"

This reverts commit a87ce9bc9648017b64fc82759c41c553c29e1441.