The driver looks like it can create valid 64-bit scatter-gather lists, so don't restrict it to a 32-bit address space.  Also use the correct busdma flags for the SRB memory area.
The driver looks like it can create valid 64-bit scatter-gather lists, so
don't restrict it to a 32-bit address space.  Also use the correct busdma
flags for the SRB memory area.

MFC After: 3 days

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