Replace "." in weirly name chip names by "_" so cargo init works

Signed-off-by: Daniel Egger <daniel@eggers-club.de>

Author: therealprof

ci/svd2rust-regress/src/tests.rs

@@ -64,7 +64,7 @@ impl TestCase {
     }
 
     pub fn name(&self) -> String {
-        format!("{:?}-{}", self.mfgr, self.chip).to_sanitized_snake_case()
+        format!("{:?}-{}", self.mfgr, self.chip.replace(".", "_")).to_sanitized_snake_case()
     }
 }