ACK: [Zesty/Artful][PATCH] UBUNTU: SAUCE: make sure ubuntu/xr-usb-serial builds for x86

[Po-Hsu Lin]

As per jesse's comment on IRC, we don't need this patch for Xenial since the module are different:

<jesse> PHLin: no, the patch applied to Xenial and Zesty/Artful to enable the module are different....

So
Acked-by: Po-Hsu Lin <po-hsu.lin at canonical.com>