Fix divide by zero errors in DML2

[Mario Limonciello]

[Impact]
Random crashes have been reported on GPUs that use DML2 (Ryzen AI APUs and Radeon 9000 dGPU). The crashes are root caused to corruption in registers used for floating point code.

[Fix]
They are caused by a lack of FP context protection around that code. They are fixed by these 3 commits:

https://github.com/torvalds/linux/commit/afcdf51d97cd58dd7a2e0aa8acbaea5108fa6826
https://github.com/torvalds/linux/commit/366e77cd4923c3aa45341e15dcaf3377af9b042f
https://github.com/torvalds/linux/commit/4408b59eeacfea777aae397177f49748cadde5ce

[Test]
1. Install ubuntu with 6.11 kernel on AMD platform
2. Run reboot test around 300 times
3. The system should not hang while booting up

[Where problems could occur]
The 3 commits are straightforward for the protection, and didn't involve any functional changes.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-oem-6.11/6.11.0-1023.23 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-oem-6.11' to 'verification-done-noble-linux-oem-6.11'. If the problem still exists, change the tag 'verification-needed-noble-linux-oem-6.11' to 'verification-failed-noble-linux-oem-6.11'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!