Set maximum I/O size for mps(4) to MAXPHYS. Looking into the code, I see no reason why it should be limited to 64K of DFLTPHYS. DMA data tag is any way set to allow MAXPHYS, S/G lists (chain elements) are sufficient and overflows are also handled. On my tests even 1MB I/Os are working fine.
Set maximum I/O size for mps(4) to MAXPHYS. Looking into the code, I see
no reason why it should be limited to 64K of DFLTPHYS. DMA data tag is any
way set to allow MAXPHYS, S/G lists (chain elements) are sufficient and
overflows are also handled. On my tests even 1MB I/Os are working fine.

Reviewed by:	ken@

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