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The way that the current readX/writeX macros are implemented on sandbox
means that when IO_TRACE is not enabled some code will throw up
incorrect warnings due to how sandbox_{read,write} is implemented. We
instead need to do the "uX __v; __v = sandbox..(..v); __v;" trick that
ARM does.
Signed-off-by: Tom Rini <trini@konsulko.com>