dmaengine: Revert "dmaengine: fsl-edma: support little endian for edma driver"

This reverts commit 002905ec.

Commit 002905ec ("dmaengine: fsl-edma: support little endian for edma
driver") incorrectly assumed that there was not little endian support
in the driver.

This causes hangs on Vybrid, so revert it so that Vybrid systems
could boot again.
Reported-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Tested-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/fsl-edma-common.c

@@ -83,14 +83,9 @@ void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
 	u32 ch = fsl_chan->vchan.chan.chan_id;
 	void __iomem *muxaddr;
 	unsigned int chans_per_mux, ch_off;
-	int endian_diff[4] = {3, 1, -1, -3};
 
 	chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR;
 	ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;
-
-	if (!fsl_chan->edma->big_endian)
-		ch_off += endian_diff[ch_off % 4];
-
 	muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
 	slot = EDMAMUX_CHCFG_SOURCE(slot);