extcon: ptn5150: Lower the noisiness of probe

The ptn5150 driver always prints device type on probe but as raw hex,
without any translation to meaningful description.  This is useful only
for board bring up time so lower the verbosity to debug.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>