[Bug 2127100] [NEW] [SRU] Fix kernel cmdline for Thor systems, drop incorrect chmod, block jammy do-release-upgrade

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[ Impact ]

 * The new Thor platform require an additional kernel command line
parameter to properly function. The nvidia-tegra-defaults is already
responsible for some specific kernel cmdline setup, adding these here
will enable this new hardware.

 * Noble will not be supported on Orin platforms initially, blocking do-
release-upgrade will prevent people from bricking their systems

 * While implementing these fixes, we realized a chmod was pushed
previously in postinst that shouldn't be there.

[ Test Plan ]

 * First bug : booting a Thor platform without this patch is not
possible if there is not another workaround implemented. Booting the
board with a noble image including this package without any manual
change of the kernel command line must work.

 * Second bug: launching do-release-upgrade on a Jammy Orin system
offers an upgrade to Noble while this will end up breaking most advanced
features. After installing this updated package, do-release-upgrade
offers no upgrade.

[ Where problems could occur ]

 * Thor platforms could still not work if these kernel parameters are
not enough.

 * Orin platforms could still upgrade from Jammy to Noble while this
path is not usable yet.

** Affects: nvidia-tegra-defaults (Ubuntu)
     Importance: High
     Assignee: Pierre Ducroquet (pinaraf)
         Status: In Progress

** Affects: nvidia-tegra-defaults (Ubuntu Jammy)
     Importance: High
     Assignee: Pierre Ducroquet (pinaraf)
         Status: In Progress

** Affects: nvidia-tegra-defaults (Ubuntu Noble)
     Importance: High
     Assignee: Pierre Ducroquet (pinaraf)
         Status: In Progress

** Affects: nvidia-tegra-defaults (Ubuntu Plucky)
     Importance: High
     Assignee: Pierre Ducroquet (pinaraf)
         Status: In Progress

** Affects: nvidia-tegra-defaults (Ubuntu Questing)
     Importance: High
     Assignee: Pierre Ducroquet (pinaraf)
         Status: In Progress


** Tags: patch
-- 
[SRU] Fix kernel cmdline for Thor systems, drop incorrect chmod, block jammy do-release-upgrade
https://bugs.launchpad.net/bugs/2127100
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