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Upstream kernel 4.14, in commit (686fef928bba6b "timer: Prepare to change timer
callback argument type") [1], introduced the timer_setup interface to replace
the init_timer/setup_timer interfaces. The primary change is that the timer
callback functions now follow the standard kernel pattern where the structure
the callback sits in is passed to the callback instead of storing a pointer to
an unassociated data type.

The setup_timer functions were removed in upstream kernel v4.15, and therefore
this change is needed in order to compile DAHDI for kernels >= 4.15.

This change follows the same strategy that was done in the kernel to while the
existing users of setup_timer were migrated to the new interface.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=686fef928bba6b