arms: unifying interrupts, timers and platform data

Signed-off-by: Adam Turowski <adam.turowski@inf.ethz.ch>

arm: GICs cleanups

Signed-off-by: Adam Turowski <adam.turowski@inf.ethz.ch>

APM88xx and gicv3_mmio: use correct addresses

Unfortunately, it still doesn't work. But this way, it gets correct values
in the identification registers IIDR.

Signed-off-by: Lukas Humbel <lukas.humbel@inf.ethz.ch>

GICv3: Add support for mem-mapped CPU interface

Not clear if this is working, since we don't have a interrupt source yet.

Signed-off-by: Lukas Humbel <lukas.humbel@inf.ethz.ch>

aarch64/apm88xxxx: Correct GIC CPU and DIST addresses

Signed-off-by: Moritz Hoffmann <moritz.hoffmann@inf.ethz.ch>

armv8: correcting GIC addresses on APM88xxxxx

Signed-off-by: Reto Achermann <reto.achermann@inf.ethz.ch>

armv8: adding missing platform stubs for mustang

Signed-off-by: Reto Achermann <reto.achermann@inf.ethz.ch>

armv8/apm88xxxx: removing directory and moving functionality to plat_* files.

Signed-off-by: Reto Achermann <reto.achermann@inf.ethz.ch>