[PATCH 1/6] pseries: avoid excess rtas calls

[Nathan Lynch]

Linas Vepstas wrote:
> 
> We don't need to look up the rtas event token once per 
> cpu per second. This avoids some misc string ops and 
> rtas calls and provides some minor performance improvement.

It does not avoid any calls to RTAS.  (rtas_token merely looks up
properties under the /rtas node.)

Otherwise, looks okay.