kernel: add own Kconfig for OpenWrt mtdsplit drivers

There are pretty many OpenWrt patches against mtd subsystem resulting
in a bit of mess and growing maintenance cost.
My idea is to use an extra "mtdsplit" directory with OpenWrt specific
files (including Kconfig).
This is the first step to achieve this. This patch adds a "mtdsplit"
directory with Kconfig and replaces 4 patches with a single one.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42287 3c298f89-4303-0410-b956-a3cf2f4a3e73
kernel: add ohci-platform.ko for 3.11+

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42288 3c298f89-4303-0410-b956-a3cf2f4a3e73
ralink: mt7620 has obchi/ehci and not dwc2

fix the default package selection

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42289 3c298f89-4303-0410-b956-a3cf2f4a3e73
ralink: fix mt7620 ohci 3.10

the ohci phy was not reset properly

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42290 3c298f89-4303-0410-b956-a3cf2f4a3e73
ralink: fix mt7620 ohci 3.14

the ohci phy was not reset properly

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42291 3c298f89-4303-0410-b956-a3cf2f4a3e73
ralink: a few 3.14 related fixes

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42292 3c298f89-4303-0410-b956-a3cf2f4a3e73
ralink: the mt7620 evb has a usb port

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42293 3c298f89-4303-0410-b956-a3cf2f4a3e73