Revert "package: kernel: dtc: Add DTO support"

Revert "package: kernel: dtc: Add DTO support"

It looks like commit 6d2f3b1b19 ("package: kernel: dtc: Add DTO support")
added this patch file 9 years ago without it ever being applied anywhere.
Back then there wasn't even a 'dtc' package, but we just used 'dtc' from
the Linux kernel sources.
Nowadays there is package/utils/dtc which is used to build dtc to be used
on the target (*not* a host-build!), and it of course already contains
support for device tree overlays since v1.4.3 from 2017...

This reverts commit 6d2f3b1b1974d742576b0902e9c4777c9ac1ba67.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Link: https://github.com/openwrt/openwrt/pull/22118
Signed-off-by: Robert Marko <robimarko@gmail.com>
(cherry picked from commit c69beade6025be79a59e78a404f91e036bff4b7e)