ACPI and power management fixes for 3.9-rc6

- Revert of a recent cpuidle change that caused Nehalem machines
  to hang on boot from Alex Shi.

- USB power management fix addressing a crash in the port device
  object's release routine from Rafael J. Wysocki.

- Device PM QoS fix for a potential deadlock related to sysfs
  interface from Rafael J. Wysocki.

- Fix for a cpufreq crash when the /cpus Device Tree node is missing
  from Paolo Pisati.

- Fix for a build issue on ia64 related to the Boot Graphics Resource
  Table (BGRT) from Tony Luck.

- Two fixes for ACPI handles being set incorrectly for device
  objects that don't correspond to any ACPI namespace nodes in
  the I2C and SPI subsystems from Rafael J. Wysocki.

- Fix for compiler warnings related to CONFIG_PM_DEVFREQ being
  unset from Rajagopal Venkat.

- Fix for a symbol definition typo in cpufreq_governor.h from
  Borislav Petkov.

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