Remove ARMMEM linker file

Replace all ARM ISRs with the default debug handler.
Embed the memory location of ARM peripherals in Zinc as they are
constant between devices.

Opinions on the naming/location of the getter function in the systick example?
why did you choose to use hardfault (the implementation is same as others at the moment) for all external interrupts? 

We can expect to have different handler for external interrupts and the hardfault.