remove obsolete stm32l1 target's drivers

[julianuziemblo]

Description

related:

• remove obsolete stm32l1 target phoenix-rtos-build#249
• remove obsolete stm32l1 targets phoenix-rtos-filesystems#158
• remove obsolete stm32l1 target support phoenix-rtos-kernel#715

Motivation and Context

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (refactoring, style fixes, git/CI config, submodule management, no code logic changes) - stm32l1 was not supported anyway - this PR just removes the last remaining mention of its

How Has This Been Tested?

• Already covered by automatic testing.
• New test added: (add PR link here).
• Tested by hand on: (list targets here).

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing linter checks and tests passed.
• My changes generate no new compilation warnings for any of the targets.

Special treatment

• This PR needs additional PRs to work (list the PRs, preferably in merge-order).
• I will merge this PR by myself when appropriate.

[gemini-code-assist]

Summary of Changes

Hello @julianuziemblo, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request performs a significant cleanup by removing all obsolete and unsupported drivers for the STM32L1 microcontroller family. This action streamlines the project's codebase, reducing maintenance overhead and ensuring that only relevant hardware-specific components are present. Additionally, a minor documentation update was made to accurately reflect the supported STM32L4 series.

Highlights

• Removal of Obsolete Drivers: All driver files and build configurations specifically for the STM32L1 microcontroller family have been completely removed from the codebase. This includes ADC, DMA, EXTI, Flash, GPIO, I2C, LCD, RCC, RTC, SPI, and UART drivers, along with their associated Makefiles and documentation.
• Documentation Cleanup: The README file for the STM32L4 multi-driver has been updated to correctly reflect the supported microcontroller family, changing the mention from STM32L152 to STM32L4x6.

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[gemini-code-assist]

Code Review

This pull request is a great cleanup effort, removing a large number of obsolete files related to the stm32l1 target. This significantly improves the maintainability of the project. I've also noticed a small correction in the README.md for the stm32l4-multi driver and have provided a suggestion to fix a couple of typos in that file.

[github-actions]

Unit Test Results

9 462 tests  +16   8 873 ✅ +16   49m 17s ⏱️ - 2m 49s
  561 suites +16     589 💤 ± 0 
    1 files   ± 0       0 ❌ ± 0 

Results for commit aa530b6. ± Comparison against base commit 4615adf.

♻️ This comment has been updated with latest results.