Remove STM32 legacy pinmap

[raiden00pl]

Description

It's been quite some time since CONFIG_STM32xx_USE_LEGACY_PINMAP was introduced. Some upstream boards have already migrated to the new pinmap, but for many there is no progress. There was enough time for users to migrate their boards.

Steps to fix this issue:

• migrate stm32f1 boards to new pinmap
• migrate stm32f2 boards to new pinmap
• migrate stm32f3 boards to new pinmap
• migrate stm32f4 boards to new pinmap
• migrate stm32l1 boards to new pinmap
• migrate stm32l4 boards to new pinmap
• migrate stm32l5 board to new pinmap
• migrate stm32wb board to new pinmap
• remove legacy pinmap from stm32h7 - boards already migrated to new pinmap
• remove legacy pinmap from stm32f7 - boards already migrated to new pinmap
• remove legacy pinmap from stm32f0l0g0 - boards already migrated to new pinmap

The biggest problem here is the port of board/stm32 boards to the new pinmap, the number of stm32 boards is quite large, so practical there is no person who can test all modified board on real HW. In this case, we must accept the risk that part of the configuration will be broken, since compiling the code without errors doesn't provide certainty that the port is still working. Here is an example of me accidentally messing up the stm32f7 configuration while migrating the pinmap: #13915. We definitely need to watch out for similar cases.

Is anyone willing to help with this issue?
Maybe someone from px4 team is interested in helping? This issue is basically a result of fixes needed for your project and it was left in "half done" state with absolutely no progress for over a year. So sad...

Verification

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