[PATCH] updates to surveillance for power5

[Nathan Fontenot]

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.

Since this is only called when a surveillance timeout is specified at
the boot propmt I also added a printk to inform users.

Paul or Anton, could you push this upstream if there are no objections.

Signed-off-by: Nathan Fontenot <nfont at austin.ibm.com>

thanks,
-Nathan F.
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