platform-drivers-x86 for 4.2-3

Fix SMBIOS call handling and hwswitch state coherency in the dell-laptop driver.
Cleanups for intel_*_ipc drivers.

dell-laptop:
 - Do not cache hwswitch state
 - Check return value of each SMBIOS call
 - Clear buffer before each SMBIOS call

intel_scu_ipc:
 - Move local memory initialization out of a mutex

intel_pmc_ipc:
 - Update kerneldoc formatting
 - Fix compiler casting warnings
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