[XenPPC] default for #address-sizes in boot_of.c

[Maria Butrico <butrico@xxxxxxxxxxxxx>]

Jimi and I had an email exchange prompted by a comment to the code he 
added to locate open pic.  Although the discussion mostly centered about 
the exact meaning of the word "sizes" (it turns out Jimi did not mean 
the value of the OF property #size-cells nor did he really mean the 
value of the OF property #address-cells.  He meant that a variable 
passed by reference to the of_getproperty function will not be altered 
if the property does not exists) this discussion uncovered that the 
boot_of code incorrectly defaults the property #address-sizes to 1, 
whereas it should default to 2, as per OF documentation (IEEE_1275 pg. 
110).  I'll send a patch for this. 

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