fix(core): fix a few "unused" Rust warnings

[no changelog]

core/embed/rust/build.rs

@@ -437,6 +437,7 @@ fn generate_trezorhal_bindings() {
         .unwrap();
 }
 
+#[cfg(feature = "crypto")]
 fn generate_crypto_bindings() {
     let out_path = env::var("OUT_DIR").unwrap();
 

core/embed/rust/src/ui/display/font.rs

@@ -1,3 +1,4 @@
+#[cfg(feature = "translations")]
 use spin::RwLockReadGuard;
 
 use crate::{

core/embed/rust/src/ui/layout_bolt/component/share_words.rs

@@ -11,6 +11,7 @@ use crate::{
 use super::super::theme;
 
 use heapless::Vec;
+#[cfg(feature = "ui_debug")]
 use ufmt::uwrite;
 
 const WORDS_PER_PAGE: usize = 4;