Simplify implementation

esp-hal/src/dma/mod.rs

@@ -1977,36 +1977,6 @@ pub trait DmaTxBuffer {
     fn length(&self) -> usize;
 }
 
-pub(crate) struct DmaBufferRef<'a, B> {
-    buffer: &'a mut B,
-}
-
-impl<'a, B> DmaBufferRef<'a, B> {
-    pub(crate) fn new(buffer: &'a mut B) -> Self {
-        Self { buffer }
-    }
-}
-
-impl<B: DmaTxBuffer> DmaTxBuffer for DmaBufferRef<'_, B> {
-    fn prepare(&mut self) -> Preparation {
-        self.buffer.prepare()
-    }
-
-    fn length(&self) -> usize {
-        self.buffer.length()
-    }
-}
-
-impl<B: DmaRxBuffer> DmaRxBuffer for DmaBufferRef<'_, B> {
-    fn prepare(&mut self) -> Preparation {
-        self.buffer.prepare()
-    }
-
-    fn length(&self) -> usize {
-        self.buffer.length()
-    }
-}
-
 /// [DmaRxBuffer] is a DMA descriptor + memory combo that can be used for
 /// receiving data from a peripheral's FIFO to a DMA channel.
 ///