xen: make sysfs files behave as their names suggest

1: make "target_kb" only accept and produce a memory size in kilobytes.
2: add a second "target" file which produces output in bytes, and will accept
   memparse input (scaled bytes)

This fixes the rather irritating problem that writing the same value
read back into target_kb would end up shrinking the domain by a factor
of 1024, with generally bad results.

Signed-off-by: Jeremy Fitzhardinge <[email protected]>
Cc: Stable Kernel <[email protected]>
Cc: "[email protected]" <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>

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