Make idle_loop a member of ppc_md

[Michael Ellerman]

Currently the idle loop is selected in idle_setup() by consulting 
systemcfg->platform and with a few ifdefs as well.

These five patches make idle_loop a member of the ppc_md structure, and moves 
the selection into the respective platforms' setup_arch().

I wrote this and then change my mind, and thought we should instead try and 
reduce the number of different idle loops. But that looks hard, perhaps 
impossible, so this might be as good as it gets.

I've boot tested on iSeries and pSeries LPAR, and compiled defconfig for 
iSeries/pSeries/maple/G5.

cheers

-- 
Michael Ellerman
IBM OzLabs

email: michael:ellerman.id.au
inmsg: mpe:jabber.org
wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person
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