Move ARM CPU configuration to arch/arm/mm.  Seperate out the selection
of the abort, cache handling, optimised page copying and TLB handling
from the Makefile, and move it into the configuration system.  This
allows us to select the correct files in arch/arm/mm and pick the
appropriate definitions in include/asm-arm/* based upon a config
symbol rather than a bunch of configuration symbols.

Also add ARM1020E, ARM1022 and ARM1026 CPU support.