intel/iommu: force writebuffer-flush quirk on Gen 4 Chipsets

We already have the quirk entry for the mobile platform, but also
reports on some desktop versions. So be paranoid and set it
everywhere.

References: http://www.mail-archive.com/[email protected]/msg33138.html
Cc: [email protected]
Cc: David Woodhouse <[email protected]>
Cc: "Sankaran, Rajesh" <[email protected]>
Reported-and-tested-by: Mihai Moldovan <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>

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