[precise] SRU: UBUNTU: SAUCE: dell-laptop: rfkill blacklist Dell XPS 13z, 15

[Kamal Mostafa]

SRU Justification [precise]:

BugLink: https://bugs.launchpad.net/bugs/901410

Impact: Prevents using WiFi without Bluetooth, or vice-versa.
Fix: Patch adds two Dell laptop models to rfkill blacklist table;
affects only those models.
Testcase: Disable Bluetooth via the indicator icon; verify that WiFi
continues to operate.

This patch is being carried in quantal as UBUNTU SAUCE.  Please
cherry-pick from quantal into precise as SRU:

        git://kernel.ubuntu.com/ubuntu/ubuntu-quantal.git master-next
        318d5bb457bc25224c36823ec19f680a98c6022f

Thanks,

 -Kamal