ionic: fix potential irq name truncation

Address a warning about potential string truncation based on the
string buffer sizes.  We can add some hints to the string format
specifier to set limits on the resulting possible string to
squelch the complaints.

Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Link: https://lore.kernel.org/r/20240529000259.25775-2-shannon.nelson@amd.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>