Clean up ARM_TP_ADDRESS and RAS location

[M. Warner Losh]

In message: <4772E502.6090804 at semihalf.com>
            Rafal Jaworowski <raj at semihalf.com> writes:
: The following patch de-hardcodes usage of ARM_TP_ADDRESS and RAS local
: storage, it also moves this special purpose page to a more convenient place
: i.e. after the vectors high page, more towards the end of address space.
: Previous location (0xe000_0000) caused grief if KVA where to go beyond the
: default limit.
: 
: http://people.freebsd.org/~raj/patches/arm/cleanup_tp_ras.diff
: 
: Let me hear your comments.

I like these patches...

Warner