Reads and writes to the FSI bus are in bus-endian format, so we need to convert.
Reads and writes to the FSI bus are in bus-endian format, so we need to
convert.

Signed-off-by: Jeremy Kerr <68a658b44bbaefab3ef5cd231967195fc0ff9d69@ozlabs.org>

open-power/pdbg,open-power/pdbg,open-power/pdbg