[Backport v4.2-branch] drivers: flash_stm32h7: Fix REAL_FLASH_SIZE_KB size #97613
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For devices other than the stm32h745/747/755/757 that use dual-core cortex-M4/cortex-M7, do not multiply flash controller size by 2. Single-core stm32h7x devices define their flash-controllers dtsi as a single area, not two banks. Use the presence of the bank2-flash-size prop to determine if this is a dual-core stm3h7x or not. Signed-off-by: Rory Piper <[email protected]> (cherry picked from commit ea1245e)
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Backport ea1245e from #93739.
Fixes #97593