Fixed ADC register defines

[jernejp21]

ADC registers were missing or had wrong bit field names according to reference manual. Added missing registers and fixed bit fields.

I would also like to point out errors in reference manual:

• Between ADC_JDR4 and ADC_AWD2CR is reserved space. Offset address is wrong - 0x8C - 0x9C; correct is 0x90 - 0x9C.
  
• Last four registers have offset value: 0x3F0, 0x3F4, 0x3F8, 0x3FC. In the title it says that offset is already 0x300. This would imply that the correct offset is 0x6F0, 0x6F4, 0x6F8, 0x6FC. But this is wrong. Offset values should be 0xF0, 0xF4, 0xF8, 0xFC and reserved space should be in between (0x12 - 0xEC).
  

[BernardPuel]

Thanks for your contribution, I have entered 2 internal tickets for the CMSIS update + Documentation.

[BernardPuel]

Documentation was updated and is under internal publication process. But the update will not be public soon ...
Thanks again.