stm32 flash size fix

[Simon Kallweit]

As stated in the stm32 errata sheet, the debug registers (MCU_ID) is not 
readable by user software and cannot be used to detect the flash size. 
It's all fine when running in debug mode (JTAG), but not as a standalone 
application. This patch hardcodes the flash and block sizes based on the 
configuration.

Simon
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