CPU idle init sequence

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Hi Rajendra,

We found a problem in the sequencing of omap_pm_init and
omap3_idle_init. It seems that cpu idle is initialized before pm. This
can cause omap_sram_idle to be called before the neccessary inits are
done. I'll post a patch that fixes this by moving the omap3_idle_init
call to omap_pm_init. Check it out if it has any problems.

Compile & boot tested the patch on SDP, with and without
CONFIG_CPU_IDLE.

regards,
Kalle
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