RTEMS | bsps/i386: Standardize APIC register definitions with x86_64 BSP (!1111)

[SHIVAM DEOLANKAR (@D3athSkulll)]

SHIVAM DEOLANKAR created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1111

Project:Branches: D3athSkulll/rtems:standardize-apic-pc386-x86_6 to rtems/rtos/rtems:main
Author:   SHIVAM DEOLANKAR



## Summary

Remove the pc386 APIC header and use the APIC definitions provided by the x86_64 BSP. Convert pc386 LAPIC register access from pointer arithmetic to array indexing and update register macros to the LAPIC_REGISTER\_\* definitions used by x86_64.

Fixes #5516

## AI Details

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### Prompt used

Help me convert the register based indexing in pc386 bsp  to array based indexing of x86_64 by using a common apic.h for both the bsps. Intend to reuse the apic.h of the x86_64 bsp and delete the apic.h of the pc386. 

### AI model used

Chatgpt 5.2

### How AI was used for the contribution

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- [ ] Test creation.
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- [ ] The entire contribution was generated using AI
- [ ] AI code completion such as Copilot in VSCode.

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### Access

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