Reformat use declarations.

The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.

compiler/rustc_target/src/asm/avr.rs

@@ -1,7 +1,9 @@
-use super::{InlineAsmArch, InlineAsmType, ModifierInfo};
-use rustc_span::Symbol;
 use std::fmt;
 
+use rustc_span::Symbol;
+
+use super::{InlineAsmArch, InlineAsmType, ModifierInfo};
+
 def_reg_class! {
     Avr AvrInlineAsmRegClass {
         reg,