RTEMS | testsuites/sptests: Add spcan02 POSIX functional test for virtual CAN bus (!1113)

[MITHILESH MATTAPALLI (@mithileshm)]

MITHILESH MATTAPALLI created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1113

Project:Branches: mithileshm/rtems:add-spcan02-test to rtems/rtos/rtems:main
Author:   MITHILESH MATTAPALLI



## Summary

This MR introduces `spcan02`, an automated POSIX functional test for the RTEMS CAN stack using the hardware-independent virtual driver (`can-virtual.c`).

**Key Verifications:**

* **API & Routing:** Validates `open`, `ioctl(RTEMS_CAN_CHIP_START)`, `write`, and `read` by routing 2000 frames between concurrent TX/RX tasks over a virtual loopback (`/dev/can0`).
* **Queue Stability:** Confirms correct handling of `-EAGAIN` during non-blocking queue exhaustion under heavy load.
* **Memory Compliance:** Executes cleanly on the `sparc/erc32` (`sis`) simulator without requiring `CONFIGURE_MEMORY_OVERHEAD`, proving the native CAN thread resource calculations provisioned in !5193 are robust.

## Generative AI

* **Prompt used:** Assisted with POSIX test boilerplate, C code formatting, and debugging SPARC memory configurations.
* **Which AI model was used:** Google Gemini 3.1 pro
* **How AI was used for the contribution:** Test creation assistance (POSIX boilerplate), Code formatting, and Debugging assistance.
* **Copyright & Access:** I have not used a product that claims copyright over the generated output, and I have legitimate access to the tool. I fully understand, have manually tested, and take full responsibility for the submitted code.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1113
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