kernel: update yaffs code

Use the latest version of the yaffs code. Fetched from the
yaffs2 git tree and it is based on the following commit:

  commit bc76682d93955cfb33051beb503ad9f8a5450578
  Merge: 3a8580e ffa781d
  Author: Charles Manning <cdhmanning@gmail.com>
  Date:   Thu Jul 11 17:46:25 2013 +1200

      Merge branch 'master' of ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39084 3c298f89-4303-0410-b956-a3cf2f4a3e73
kernel: remove obsolete yaffs options from target configs

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39085 3c298f89-4303-0410-b956-a3cf2f4a3e73
kernel/3.1[02]: add Winbond W25X05 SPI flash support

It is used on newer RouterBOARDs.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39086 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: rb95x: nuke rb95x_gpio_init

Set up the chipselect GPIO directly in rb95x_nand_init
instead.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39087 3c298f89-4303-0410-b956-a3cf2f4a3e73