refactor(core/rust): implement io::Error

### core/embed/rust/src/io.rs
@@ -1,7 +1,19 @@
-use crate::error::Error;
 #[cfg(feature = "micropython")]
 use crate::micropython::{buffer::get_buffer, gc::Gc, obj::Obj};
 
+pub enum Error {
+    EOFError,
+}
+
+#[cfg(feature = "micropython")]
+impl From<Error> for crate::micropython::error::Error {
+    fn from(error: Error) -> Self {
+        match error {
+            Error::EOFError => crate::micropython::error::Error::EOFError,
+        }
+    }
+}
+
 pub struct InputStream<'a> {
     buf: &'a [u8],
     pos: usize,
@@ -161,11 +173,11 @@ impl From<Gc<[u8]>> for BinaryData<'static> {
 
 #[cfg(feature = "micropython")]
 impl TryFrom<Obj> for BinaryData<'static> {
-    type Error = Error;
+    type Error = crate::micropython::error::Error;
 
     fn try_from(obj: Obj) -> Result<Self, Self::Error> {
         if !obj.is_bytes() {
-            return Err(Error::TypeError);
+            return Err(crate::micropython::error::Error::TypeError);
         }
         Ok(Self::Object(obj))
     }

### core/embed/rust/src/protobuf/encode.rs
@@ -207,7 +207,7 @@ impl<'a> OutputStream for BufferStream<'a> {
                 *pos += len;
                 buf.copy_from_slice(val);
             })
-            .ok_or_else(error::end_of_buffer)
+            .ok_or(Error::EOFError)
     }
 
     fn write_byte(&mut self, val: u8) -> Result<(), Error> {
@@ -218,6 +218,6 @@ impl<'a> OutputStream for BufferStream<'a> {
                 *pos += 1;
                 *buf = val;
             })
-            .ok_or_else(error::end_of_buffer)
+            .ok_or(Error::EOFError)
     }
 }