kernel: bump 4.9 to 4.9.57

Refresh patches.
Compile-tested for ar71xx - Archer C7 v2
Runtime-tested on  ar71xx - Archer C7 v2

Fixes the following CVEs:

- CVE-2017-7518
- CVE-2017-0786
- CVE-2017-1000255
- CVE-2017-12188
- CVE-2017-15265

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>

target/linux/layerscape/patches-4.9/601-net-support-layerscape.patch

@@ -1065,7 +1065,7 @@ Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
  static void mlx5e_set_rx_mode(struct net_device *dev)
 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
 +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
-@@ -948,15 +948,13 @@ out:
+@@ -949,15 +949,13 @@ out:
  /* Return the stats from a cache that is updated periodically,
   * as this function might get called in an atomic context.
   */

target/linux/layerscape/patches-4.9/810-iommu-support-layerscape.patch

@@ -34,7 +34,7 @@ Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
  
  	return entry->group;
  }
-@@ -3159,9 +3161,10 @@ static bool amd_iommu_capable(enum iommu
+@@ -3160,9 +3162,10 @@ static bool amd_iommu_capable(enum iommu
  	return false;
  }
  
@@ -47,7 +47,7 @@ Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
  	struct unity_map_entry *entry;
  	int devid;
  
-@@ -3170,41 +3173,56 @@ static void amd_iommu_get_dm_regions(str
+@@ -3171,41 +3174,56 @@ static void amd_iommu_get_dm_regions(str
  		return;
  
  	list_for_each_entry(entry, &amd_iommu_unity_map, list) {
@@ -118,7 +118,7 @@ Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
  {
  	struct dma_ops_domain *dma_dom = to_dma_ops_domain(to_pdomain(domain));
  	unsigned long start, end;
-@@ -3228,9 +3246,9 @@ static const struct iommu_ops amd_iommu_
+@@ -3229,9 +3247,9 @@ static const struct iommu_ops amd_iommu_
  	.add_device = amd_iommu_add_device,
  	.remove_device = amd_iommu_remove_device,
  	.device_group = amd_iommu_device_group,