kernel: bump 4.9 to 4.9.82

Refresh patches.
Remove upstreamed patches:
- ar7/002-MIPS-AR7-ensure-the-port-type-s-FCR-value-is-used.patch
- backport/040-crypto-fix-typo-in-KPP-dependency-of-CRYPTO_ECDH.patch
Remove layerscape/819-Revert-dmaengine-dmatest-move-callback-wait-queue-to.patch,
it is superseded by upstream commit 297c7cc4b5651b174a62925b6c961085f04979fd.
Remove pending/650-pppoe_header_pad.patch, it is superseded by
upstream commit 1bd21b158e07e0b8c5a2ce832305a0ebfe42c480.
Update patches that no longer apply:
- ar71xx/004-register_gpio_driver_earlier.patch
- hack/204-module_strip.patch
- pending/493-ubi-set-ROOT_DEV-to-ubiblock-rootfs-if-unset.patch

Fixes CVE-2017-8824.

Compile-tested: ar71xx.
Runtime-tested: ar71xx.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

target/linux/generic/pending-4.9/491-ubi-auto-create-ubiblock-device-for-rootfs.patch

@@ -8,7 +8,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
 
 --- a/drivers/mtd/ubi/block.c
 +++ b/drivers/mtd/ubi/block.c
-@@ -627,6 +627,44 @@ static void __init ubiblock_create_from_
+@@ -635,6 +635,44 @@ static void __init ubiblock_create_from_
  	}
  }
  
@@ -53,7 +53,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  static void ubiblock_remove_all(void)
  {
  	struct ubiblock *next;
-@@ -657,6 +695,10 @@ int __init ubiblock_init(void)
+@@ -667,6 +705,10 @@ int __init ubiblock_init(void)
  	 */
  	ubiblock_create_from_param();