Update to atdf2svd version 0.5.0

[Rahix]

The new version includes Rahix/atdf2svd#67.

[Rahix]

Full diff of the changes: svd.diff.txt

Affected targets:

• ATmega4809
• ATtiny1614
• ATtiny202
• ATtiny212
• ATtiny214
• ATtiny412
• ATtiny414
• ATtiny416
• ATtiny816

For each chip, for some registers, <writeConstraint>s are replaced by proper fields. Unfortunately, this is a breaking change as it makes the previously safe bits() method for those registers unsafe again:

     #[doc = "Writes raw bits to the register."]
     #[inline(always)]
-    pub fn bits(&mut self, bits: u8) -> &mut Self {
-        unsafe { self.0.bits(bits) };
+    pub unsafe fn bits(&mut self, bits: u8) -> &mut Self {
+        self.0.bits(bits);
         self
     }