[Profile] Add STM32H7 Cache & Memory Constraints

[abduznik]

The STM32H7 is a complex Cortex-M7 chip where memory management is critical.

Task

Create profiles/stm32h7.yaml.

Required Constraints

1. Cache Coherency: If DMA is used, check for missing D-Cache clean/invalidate calls (SCB_CleanDCache).
2. Memory Domains: DMA cannot access DTCM RAM. Flag buffers that might be placed there.
3. Alignment: DMA buffers usually require 32-byte alignment for cache line safety.

Example

See profiles/esp32.yaml for the format.