devices: replace .into_iter() on ref with .iter()

Fixes clippy warning:

  this `.into_iter()` call is equivalent to `.iter()` and will not
  consume the `slice`

https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref

BUG=None
TEST=bin/clippy

Change-Id: Id31c3f6252b86a7f453ab4e6e7dac0ed6654bc52
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2885782
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Daniel Verkamp <dverkamp@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>

bin/clippy

@@ -34,7 +34,6 @@ SUPPRESS=(
     extra_unused_lifetimes
     for_kv_map
     inefficient_to_string
-    into_iter_on_ref
     let_unit_value
     missing_safety_doc
     needless_range_loop

devices/src/virtio/video/decoder/backend/vda.rs

@@ -183,7 +183,7 @@ impl DecoderSession for libvda::decode::Session {
         planes: &[FramePlane],
         modifier: u64,
     ) -> VideoResult<()> {
-        let vda_planes: Vec<libvda::FramePlane> = planes.into_iter().map(Into::into).collect();
+        let vda_planes: Vec<libvda::FramePlane> = planes.iter().map(Into::into).collect();
         Ok(self.use_output_buffer(
             picture_buffer_id,
             libvda::PixelFormat::try_from(format)?,

devices/src/virtio/video/encoder/mod.rs

@@ -628,7 +628,7 @@ impl<T: Encoder> EncoderDevice<T> {
                 let resource_info = get_resource_info(resource_bridge, uuid)?;
 
                 let planes: Vec<VideoFramePlane> = resource_info.planes[0..num_planes]
-                    .into_iter()
+                    .iter()
                     .map(|plane_info| VideoFramePlane {
                         offset: plane_info.offset as usize,
                         stride: plane_info.stride as usize,