i2c: iproc: When there's an error treat it as an error

If the xfer fails, it indicates a real error. Log it with an
error message instead of a debug message to reflect its severity.

Link: https://lore.kernel.org/r/20250418211635.2666234-10-andi.shyti@kernel.org


Signed-off-by: Andi Shyti <andi.shyti@kernel.org>