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These were inadvertently removed with a recent upgrade to CMSIS, where
those registers were no longer defined in the CMSIS headers, and hence
no longer extracted.

CMSIS v2.5.0 removed all uint32_t casts and uses only Misra Cast (U)

Adds 924 bytes of code, but means that no more hacks and work-arounds are
needed due to large constants becoming negative.

This causes unnecessary constants to no longer be generated.
Some constants (like UART_BRR) are different between the F4 and F7

This is just a clean-up of the code.  Generated code is exactly the
same.