This harmless print provides a very easy way of knowing
if the modem is detected properly during probing.

Promote it to an informational print so no hassle is required
enabling kernel debugging info to obtain it.

The rationale here is that:
On a lot of low-storage embedded devices, extensive kernel
debugging info is not always present as this would
increase it's size to much causing partition size issues.
Signed-off-by: Koen Vandeputte <koen.vandeputte@citymesh.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Link: https://lore.kernel.org/r/20220831100349.1488762-1-koen.vandeputte@citymesh.com
[mani: added missing review tags]
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>