i2c: npcm: restore slave addresses array length

The smatch check warning is "buffer overflow 'npcm_i2caddr' 2 <= 9".
The original design supports 10 target addresses although only 2
addresses are required for current implementation.

Restore the npcm_i2caddr array length to fix the smatch warning.

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202408130818.FgDP5uNm-lkp@intel.com/


Signed-off-by: Tyrone Ting <kfting@nuvoton.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>