ACPI fixes for v4.11-rc5

 - Drop the unconditional setting of the '-Os' gcc flag from the ACPI
   Makefile to make the function graph tracer work correctly with the
   ACPI subsystem (Josh Poimboeuf).

 - Add missing synchronize_rcu() to ghes_remove() which removes an
   element from an RCU-protected list, but fails to synchronize it
   properly afterward (James Morse).

 - Fix two problems related to IOAPIC hotplug, a local variable
   initialization in setup_res() and the creation of platform
   device objects for IO(x)APICs which are (a) unused and (b) leaked
   on hot-removal (Joerg Roedel).
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