rust: Convert k_str_out to bindgen one

Remove the manual k_str_out wrapper, and use the one generated by bindgen.

Signed-off-by: David Brown <david.brown@linaro.org>

lib/rust/main.c

@@ -16,14 +16,4 @@ int main(void)
 	return 0;
 }
 
-#ifdef CONFIG_PRINTK
-/*
- * Until we have syscall support in Rust, wrap this syscall.
- */
-void wrapped_str_out(char *c, size_t n)
-{
-	k_str_out(c, n);
-}
-#endif
-
 #endif

lib/rust/zephyr/src/printk.rs

@@ -77,7 +77,7 @@ impl Context {
     fn flush(&mut self) {
         if self.count > 0 {
             unsafe {
-                wrapped_str_out(self.buf.as_ptr(), self.count);
+                zephyr_sys::k_str_out(self.buf.as_mut_ptr() as *mut i8, self.count);
             }
             self.count = 0;
         }
@@ -111,7 +111,3 @@ pub fn printkln(args: Arguments<'_>) {
     context.add_byte(b'\n');
     context.flush();
 }
-
-extern "C" {
-    fn wrapped_str_out(buf: *const u8, len: usize);
-}