Patch SVD file

[dvdsk]

I need PWM support in nrf52832-hal, the code is there but cannot be enabled as it needs various task_ writers that (are present for other nrf528xx chips) are missing. This is caused by #12. I checked if this was fixed in the latest release (8.38.0) of svd files by nordic¹

Therefore I have tried my hand at patching the SVD file for the task_ and event_ registers. I am way out of my depth here, someone should really check my work, I did the following:

• Wrote a python script (fix_svd.py) to confirm that every task and event register has a field with the same name² in nrf52840.svd
• Modified that script to add a fields section to each task_ and event_ register:

  <fields>
    <field>
     <name>{field_name}</name>
      <lsb>0</lsb>
      <msb>0</msb>
    </field>
  </fields>

• ran the python script which generated nrf52832_fixed.svd
• deleted src/, build.rs and device.x
• used update.sh to regenerate the Peripheral API

1: in that release nrf52.svd seems to be the nrf52832's svd file
2: the names for some events registers end on [%s] these then have a field missing the [%s]

[dvdsk]

The split into nrf52832.svd and nrf52832_fixed.svd causes the large amount of lines added in this PR. I should probably do away with that because of that and as it makes a diff more work.. I wonder if I should keep the python script. I included it because it could be useful if Nordic updates the svd without fixing this issue and because checking the scripts logic seemed easier then comparing the svd's.