Board gets additionally listed in the wrong platform in `pio board`

[FFY00]

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Configuration

Operating system:
Arch Linux

PlatformIO Version (platformio --version):

$ pio --version
PlatformIO Core, version 6.1.5

Description of problem

In platformio/platform-ststm32#670 I added a board definition, but when I went to use it I noticed that pio boards is outputting incorrect information. The board in question is an ST Nucleo H7A3ZI-Q, which should be only listed under the ststm32 platform, instead it is also listed under atmelavr.

Steps to Reproduce

1. Copy nucleo_h7a3zi_q.json from Add Nucleo H7A3ZI-Q and H755ZI-Q boards platform-ststm32#670 to a project
2. Run pio boards h7a3

Actual Results

$ pio boards h7a3

Platform: atmelavr
=================================================================================
ID               MCU             Frequency    Flash    RAM     Name
---------------  --------------  -----------  -------  ------  ------------------
nucleo_h7a3zi_q  STM32H7A3ZIT6Q  280MHz       2MB      1.34MB  ST Nucleo H7A3ZI-Q

Platform: ststm32
=================================================================================
ID               MCU             Frequency    Flash    RAM     Name
---------------  --------------  -----------  -------  ------  ------------------
nucleo_h7a3zi_q  STM32H7A3ZIT6Q  280MHz       2MB      1.34MB  ST Nucleo H7A3ZI-Q

Expected Results

$ pio boards h7a3

Platform: ststm32
=================================================================================
ID               MCU             Frequency    Flash    RAM     Name
---------------  --------------  -----------  -------  ------  ------------------
nucleo_h7a3zi_q  STM32H7A3ZIT6Q  280MHz       2MB      1.34MB  ST Nucleo H7A3ZI-Q

[ivankravets]

If you add custom boards, you can specify the platforms list of compatible platforms.