[PATCH] updates to surveillance for power5

[Paul Mackerras]

Nathan Fontenot writes:

> This patch updates enable_surveillance() so we do not return an error
> on platforms (notably power5) that do not have a surveillance sensor.
> Additionaly, the rtas_call was changed to rtas_set_indicator as to avoid
> having to handle RTAS_BUSY returns.

Could you just add a #define in rtas.h for the -3 value and use that
instead of the literal -3 please?  Looks good apart from that.

Paul.

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