mmc: msm_sdcc: remove needless cache flush after dma_unmap_sg()

dma_unmap_sg() already flushes the cache, I don't get what this
code is doing here.

Signed-off-by: Linus Walleij <[e-mail]>
Signed-off-by: Chris Ball <[e-mail]>

drivers/mmc/host/msm_sdcc.c

···
 	dma_unmap_sg(mmc_dev(host->mmc), host->dma.sg, host->dma.num_ents,
 		     host->dma.dir);
 
-	if (host->curr.user_pages) {
-		struct scatterlist *sg = host->dma.sg;
-		int i;
-
-		for (i = 0; i < host->dma.num_ents; i++)
-			flush_dcache_page(sg_page(sg++));
-	}
-
 	host->dma.sg = NULL;
 	host->dma.busy = 0;