powerpc/powernv: convert codes returned by OPAL calls

OPAL has its own list of return codes. The patch provides a translation
of such codes in errnos for the opal_sensor_read call, and possibly
others if needed.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --cc arch/powerpc/include/asm/opal.h
Simple merge

diff --cc arch/powerpc/platforms/powernv/opal-sensor.c
Simple merge

diff --cc arch/powerpc/platforms/powernv/opal.c
Simple merge