firewire: core: obsolete tcode check macros with inline functions

This commit declares the helper functions to check tcode to obsolete
the functional macros.

Link: https://lore.kernel.org/r/20240428071347.409202-7-o-takashi@sakamocchi.jp


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