irq: Cast register access macros to `irq_t` type.
fs_pty: Use appropriate sscanf formatting.
la: Remove duplicate definition of the netif.
pvr: Add enum value for our 'no list' `pvr_list_t` value.
dmac: Use appropriate types and enum values.
cdrom: Use correct enum values and types.
treewide: Provide `void` rather than empty parameters.
examples: Add `INIT_DEFAULT` to restore basic functions.