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it is superseded by upstream commit 297c7cc4b5651b174a62925b6c961085f04979fd.
Remove pending/650-pppoe_header_pad.patch, it is superseded by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/ixp4xx/patches-4.9/160-delayed_uart_io.patch

@@ -18,7 +18,7 @@
  		uart->capabilities	= up->capabilities;
 --- a/drivers/tty/serial/serial_core.c
 +++ b/drivers/tty/serial/serial_core.c
-@@ -2229,6 +2229,7 @@ uart_report_port(struct uart_driver *drv
+@@ -2231,6 +2231,7 @@ uart_report_port(struct uart_driver *drv
  		snprintf(address, sizeof(address),
  			 "I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
  		break;
@@ -26,7 +26,7 @@
  	case UPIO_MEM:
  	case UPIO_MEM16:
  	case UPIO_MEM32:
-@@ -2893,6 +2894,7 @@ int uart_match_port(struct uart_port *po
+@@ -2895,6 +2896,7 @@ int uart_match_port(struct uart_port *po
  	case UPIO_HUB6:
  		return (port1->iobase == port2->iobase) &&
  		       (port1->hub6   == port2->hub6);