sparc/irq: use seq_put_decimal_ull_width() for decimal values

Performance improvement for reading /proc/interrupts on arch sparc

Signed-off-by: David Wang <00107082@163.com>
Reviewed-by: Andreas Larsson <andreas@gaisler.com>
Tested-by: Andreas Larsson <andreas@gaisler.com>
Link: https://lore.kernel.org/r/20241108161123.9637-1-00107082@163.com


Signed-off-by: Andreas Larsson <andreas@gaisler.com>