ethernet: ucc_geth: use UCC_GETH_{RX,TX}_BD_RING_ALIGNMENT macros directly

These macros both have the value 32, there's no point first
initializing align to a lower value.

If anything, one could throw in a
BUILD_BUG_ON(UCC_GETH_TX_BD_RING_ALIGNMENT < 4), but it's not worth it
- lots of code depends on named constants having sensible values.

Signed-off-by: Rasmus Villemoes <[e-mail]>
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/freescale/ucc_geth.c

···
 		    UCC_GETH_TX_BD_RING_SIZE_MEMORY_ALIGNMENT)
 			length += UCC_GETH_TX_BD_RING_SIZE_MEMORY_ALIGNMENT;
 		if (uf_info->bd_mem_part == MEM_PART_SYSTEM) {
-			u32 align = 4;
-			if (UCC_GETH_TX_BD_RING_ALIGNMENT > 4)
-				align = UCC_GETH_TX_BD_RING_ALIGNMENT;
+			u32 align = UCC_GETH_TX_BD_RING_ALIGNMENT;
+
 			ugeth->tx_bd_ring_offset[j] =
 				(u32) kmalloc((u32) (length + align), GFP_KERNEL);
 
···
 	for (j = 0; j < ug_info->numQueuesRx; j++) {
 		length = ug_info->bdRingLenRx[j] * sizeof(struct qe_bd);
 		if (uf_info->bd_mem_part == MEM_PART_SYSTEM) {
-			u32 align = 4;
-			if (UCC_GETH_RX_BD_RING_ALIGNMENT > 4)
-				align = UCC_GETH_RX_BD_RING_ALIGNMENT;
+			u32 align = UCC_GETH_RX_BD_RING_ALIGNMENT;
+
 			ugeth->rx_bd_ring_offset[j] =
 				(u32) kmalloc((u32) (length + align), GFP_KERNEL);
 			if (ugeth->rx_bd_ring_offset[j] != 0)