[ofw] turn down debug output in HCA drivers

[Sean Hefty]

thanks - I just couldn't easily figure out how to do this myself

>Done in 2163.
>
>> Subject: [ofw] turn down debug output in HCA drivers
>>
>> Can we turn off these messages by default in the debug build
>> of the drivers?
>>
>> Mapped 64 chunks/256 KB at 108040000 for ICM.
>>
>> Mapped 64 chunks/256 KB at 100080000 for ICM.
>>
>> Mapped 8 chunks/256 KB at 10c040000 for ICM.
>>
>> Mapped 64 chunks/256 KB at 1000c0000 for ICM.