replacing umlaute and fixing address in headers Haldeneggsteig -> Universitaetsstrasse

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

ARM: unifying coreboot on ARMv7 and ARMv8

Coreboot:
* use of hwid_t instead of coreid_t to ensure enough size
* adding context id parameter to the start function

ARMv8:
* removing PSCI debug syscall and use ipi_cap instead
* implementaton of platform specific call functions

ARMv7:
* adapting call sites to deal with new argument
* adaption of platform boot function

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

Refactoring core boot-up logic in kernel.

Move architecture independent logic into single arch-independent
syscall for all platforms. Handle arch specific boot-up with
specialized function (usually defined in start_aps.c).