ARM: ixp4xx: Drop all common code

After moving away from all the code we depend on in common we can
get a clean device tree boot and delete the common code in
arch/arm/mach-ixp4xx/common.c altogether.

Two physical register addresses remain in use, just copy these
verbatim into uncompress.h.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20220211223238.648934-13-linus.walleij@linaro.org


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>