adding dsi peripheral support about emgo HOT 2 CLOSED

One thing I found is that it doesn't handle bare named registers, for instance DSI has a register called simply "VR", and there's a define for "DSI_VR"; stm32xgen looks for a register called "VR_" and fails to find anything, so the bits don't get added to it.

I put in code to skip any register bitmasks that end in _\d, they were failing to parse

The issue of redefined constants seems to be unrelated; I don't think stm32xgen has any provision to deal with register bits that have the same name in different registers.

from emgo.

I got a handle on the tweaks code in stm32xgen, came up with solutions to the issues and made a pull request:

#23

from emgo.