[arm64] Add qrtr to kernel-image udeb

Emanuele Roccarequested to merge
ema/linux:arm64-d-i-add-qrtr into master

Netboot installer images work fine on the Thinkpad X13s, while the netinst versions boot into a blank display. This is due to qrtr.ko not being included in the netinst initrd. The module is instead included in netboot images by virtue of being a dependency of qrtr_mhi, shipped with the nic-wireless-modules udeb.

Explicitly add qrtr to kernel-image for arm64.

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