ACPI processor throttling problem in 2.4.10

[Martin Röder]

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Hi,

with the 2.4.10 kernel my processor doesn't enter the C2 power state any 
more. I found the reason to be the state promotion part of pr_power_idle() 
which actually does no state promotion if bm_control is 0.
As far as I understand, the bm_control flag should only disable the C3 state 
on machines where busmastering can't be controlled and not disable state 
changing completely.
The attached patch should correct this problem.

  Martin
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