firewire: core: arrangement header inclusion for tracepoints events

It is a bit inconvenient to put the relative path to local header from
tree-wide header.

This commit delegates the selection to include headers into users.

Link: https://lore.kernel.org/r/20240605235155.116468-11-o-takashi@sakamocchi.jp


Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>