[RFC] uartlite driver MicroBlaze compatability

[John Williams]

Hi Peter,

The attached patch gets your uartlite driver going on MicroBlaze.

All readb/writeb ops are converted to ioread32/iowrite32.

On MicroBlaze readb/writeb are picking up the MSB, instead of LSB, and 
thus reading all zeros instead of the 8-bit control/status/FIFO 
registers that you intended.

Can you please confirm if this works on PPC?

I note that Grant's recent bootloader driver uses in_be32/out_be32 - 
would you prefer that instead of ioread32/iowrite32?

Thanks,

John
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