Revert "powerpc/powernv: Fix endian bug in LPC bus debugfs accessors"

This reverts commit bf7588a0

.

Ben says although the code is not correct "[this] fix was completely
wrong and does more damages than it fixes things."

Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>