Examples | can/hello_can: Add minimal virtual CAN initialization example (!22)

[MITHILESH MATTAPALLI (@mithileshm)]

MITHILESH MATTAPALLI created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems-examples/-/merge_requests/22

Project:Branches: mithileshm/rtems-examples:add-hello-can-example to rtems/rtos/rtems-examples:main
Author:   MITHILESH MATTAPALLI



## Summary

This patch introduces a minimal hello_can application that demonstrates how to initialize the CAN subsystem, register virtual controllers (can_virtual.c), and execute basic POSIX API calls.

Additionally, this commit resolves a missing \<stdlib.h\> compiler error in the x86_display_cpu example flagged by the RTEMS 7 toolchain.

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