platform-drivers-x86 for 4.9-3

Minor doc fix, a DMI match for ideapad and a fix to toshiba-wmi to avoid loading
on non-toshiba systems.

Documentation/ABI:
 - ibm_rtl: The "What:" fields are incomplete

toshiba-wmi:
 - Fix loading the driver on non Toshiba laptops

ideapad-laptop:
 - Add another DMI entry for Yoga 900
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