Add Note 5 user agent variant to Dpdb cache

[johnmaf]

We found that for one of our devices (a Samsung Note 5) the distortions were not being applied correctly, the reason being that the model number is "SM-N920W8" for Canadian devices.

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[johnmaf]

I signed it!!

[googlebot]

CLAs look good, thanks!

[borismus]

I'll accept this change for now, but keep in mind that DPDB is autogenerated from an internal database so at some point in the future, your change may be reverted.