[Intrepid] SRU: Revert change of acpi integer to 64bit on 32bit systems

[Stefan Bader]

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/337019

SRU justification:

Impact: One of the stable release updates for Intrepid changed the size of an 
acpi integer from 32 to 64bit on 32bit builds. This had a bad side effect when 
using closed source graphics drivers on machines that exposed video adapters 
via acpi tables. On those systems the start of X locked up with a solid black 
screen without any chance to type normal commands (or change to the terminal).
More recent NVidia drivers (180) work with that change but the default in 
intrepid is 177.

Fix: Revert the change to acpi integer size (and one follow-up patch to this).

Testcase: Tested by affected users.

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