Inspired by the work of Julien Grall <firstname.lastname@example.org>,
2015-10-20 09:14:56, but heavily adjusted.
Simply moving the interrupt allocation and release functions into files
which belong to the architecture. Since x86 interrupt handling is quite
distinct from other architectures, this is a crucial necessary step.
Identifying the border between x86 and architecture-independent is
actually quite tricky. Similarly, getting the prototypes for the
border right is also quite tricky.
Since interrupt structure allocation/release is now in architecture
code, the malloc structure needs to be passed. Some architectures also
need the device when allocating interrupts.