Ability to force the physical location of a kmalloc for testing purposes

[Kumar Gala]

We are trying to test some IO DMA code and want to make sure the  
physical address is in a given range for testing.  For example on  
PPC32 w/have 36-bit physical and some of IO devices are capable of  
DMAing to the full 36-bit address.  However we want to test things  
like making sure a physical address >4G works properly.

- k
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