[3.19-stable only] Revert "dmaengine: pl330: Fix overflow when reporting residue in memcpy"

This reverts commit 3f99e272.

Not suitable for 3.19-stable:
'struct dma_pl330_desc' has no member named 'bytes_requested'
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

drivers/dma/pl330.c

@@ -2521,7 +2521,6 @@ pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
 		desc->rqcfg.brst_len = 1;
 
 	desc->rqcfg.brst_len = get_burst_len(desc, len);
-	desc->bytes_requested = len;
 
 	desc->txd.flags = flags;