kernel: update kernel 4.4 to version 4.4.30

This patch bumps the 4.4 kernel from .28 to .30 and refreshes the patches.
Compile-tested on ar71xx, x86/64, ramips/mt7621, brcm47xx and kirkwood.

Run-tested on ar71xx & ramips/mt7621, brcm47xx and kirkwood (last two confirmed
by P. Wassi).

Signed-off-by: Stijn Segers <francesco.borromini@inventati.org>

target/linux/generic/patches-4.4/051-0002-ovl-override-creds-with-the-ones-from-the-superblock.patch

@@ -105,7 +105,7 @@ Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
 -out_free_link:
  	if (link)
  		free_page((unsigned long) link);
-
+ 
 --- a/fs/overlayfs/dir.c
 +++ b/fs/overlayfs/dir.c
 @@ -408,28 +408,13 @@ static int ovl_create_or_link(struct den

target/linux/generic/patches-4.4/477-mtd-add-spi-nor-add-mx25u3235f.patch

@@ -1,5 +1,5 @@
---- a/drivers/mtd/spi-nor/spi-nor.c	2016-10-09 00:34:19.206155838 +0200
-+++ b/drivers/mtd/spi-nor/spi-nor.c	2016-10-09 00:37:11.048495602 +0200
+--- a/drivers/mtd/spi-nor/spi-nor.c
++++ b/drivers/mtd/spi-nor/spi-nor.c
 @@ -721,6 +721,7 @@ static const struct flash_info spi_nor_i
  	{ "mx25l3205d",  INFO(0xc22016, 0, 64 * 1024,  64, SECT_4K) },
  	{ "mx25l3255e",  INFO(0xc29e16, 0, 64 * 1024,  64, SECT_4K) },