crypto: replace scatterwalk_sg_next with sg_next

Modify crypto drivers to use the generic SG helper since
both of them are equivalent and the one from crypto is redundant.

See also:
  468577abe37ff7b453a9ac613e0ea155349203ae   reverted in
  b2ab4a57b018aafbba35bff088218f5cc3d2142e

Signed-off-by: Cristian Stoica <cristian.stoica@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/caam/sg_sw_sec4.h b/drivers/crypto/caam/sg_sw_sec4.h
index ce28a56..3b91821 100644
--- a/drivers/crypto/caam/sg_sw_sec4.h
+++ b/drivers/crypto/caam/sg_sw_sec4.h
@@ -37,7 +37,7 @@
 		dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg),
 				   sg_dma_len(sg), offset);
 		sec4_sg_ptr++;
-		sg = scatterwalk_sg_next(sg);
+		sg = sg_next(sg);
 		sg_count--;
 	}
 	return sec4_sg_ptr - 1;
@@ -67,7 +67,7 @@
 		nbytes -= sg->length;
 		if (!sg_is_last(sg) && (sg + 1)->length == 0)
 			*chained = true;
-		sg = scatterwalk_sg_next(sg);
+		sg = sg_next(sg);
 	}
 
 	return sg_nents;
@@ -93,7 +93,7 @@
 		int i;
 		for (i = 0; i < nents; i++) {
 			dma_map_sg(dev, sg, 1, dir);
-			sg = scatterwalk_sg_next(sg);
+			sg = sg_next(sg);
 		}
 	} else {
 		dma_map_sg(dev, sg, nents, dir);
@@ -109,7 +109,7 @@
 		int i;
 		for (i = 0; i < nents; i++) {
 			dma_unmap_sg(dev, sg, 1, dir);
-			sg = scatterwalk_sg_next(sg);
+			sg = sg_next(sg);
 		}
 	} else {
 		dma_unmap_sg(dev, sg, nents, dir);