platform-drivers-x86 for 4.7-2

Minor kconfig dependency cleanup, trivial mic mute hotkey for ideapad, and a
needed improvement in adaptive keyboard detection for thinkpad.

platform/x86:
 - Drop duplicate dependencies on X86

thinkpad_acpi:
 - Add support for HKEY version 0x200

ideapad_laptop:
 - Add an event for mic mute hotkey
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