Update OpenWrt base

We got most of our patches backported by upstream :)

patches/openwrt/0045-kernel-gpio_keys-load-module-on-pre-init.patch

-From: Matthias Schiffer <mschiffer@universe-factory.net>
-Date: Sun, 28 Feb 2016 03:42:29 +0100
-Subject: kernel/gpio_keys: load module on pre-init
-
-fix rescue mode on wdr4900
-
-Backport of r48793
-
-diff --git a/package/kernel/linux/modules/input.mk b/package/kernel/linux/modules/input.mk
-index 86ff33c..eed9aa2 100644
---- a/package/kernel/linux/modules/input.mk
-+++ b/package/kernel/linux/modules/input.mk
-@@ -75,7 +75,7 @@ define KernelPackage/input-gpio-keys
- 	CONFIG_KEYBOARD_GPIO \
- 	CONFIG_INPUT_KEYBOARD=y
-   FILES:=$(LINUX_DIR)/drivers/input/keyboard/gpio_keys.ko
--  AUTOLOAD:=$(call AutoProbe,gpio_keys)
-+  AUTOLOAD:=$(call AutoProbe,gpio_keys,1)
- endef
- 
- define KernelPackage/input-gpio-keys/description

patches/openwrt/0046-ar71xx-lzma-loader-fix-O32-ABI-conformance.patch

-From: Matthias Schiffer <mschiffer@universe-factory.net>
-Date: Sun, 28 Feb 2016 04:49:51 +0100
-Subject: ar71xx/lzma-loader: fix O32 ABI conformance
-
-According to the calling convention of the o32 ABI the caller
-function must reserve stack space for $a0-$a3 registers in case
-the callee needs to save its arguments.
-
-The assembly code of the loader does not reserve stack space for
-these registers thus when the 'loader_main' function needs to save
-its arguments, those will be stored in the 'workspace' area instead
-of the stack.
-
-Because the workspace area is also used by other part of the code, the
-saved register values gets overwritten and this often leads to failed
-kernel boots.
-
-Fix the code to reserve stack space for the registers to avoid this
-error.
-
-Backport of r48279
-
-diff --git a/target/linux/ar71xx/image/lzma-loader/src/head.S b/target/linux/ar71xx/image/lzma-loader/src/head.S
-index 543996a..47a7c9b 100644
---- a/target/linux/ar71xx/image/lzma-loader/src/head.S
-+++ b/target/linux/ar71xx/image/lzma-loader/src/head.S
-@@ -109,6 +109,9 @@ __bss_check:
- 	/* Setup new "C" stack */
- 	la	sp, _stack
- 
-+	/* reserve stack space for a0-a3 registers */
-+	subu	sp, 16
-+
- 	/* jump to the decompressor routine */
- 	la	t0, loader_main
- 	jr	t0