zephyr-kernel-src-2.6.1: Add dtc patch.

fd8bf397 should have also applied the
dtc.patch to the 2.6.1 kernel. This commits applies it, so both 2.7.1
and 2.6.1 work.

Signed-off-by: Eilís Ní Fhlannagáin <elizabeth.flanagan@huawei.com>
Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>

meta-zephyr-core/recipes-kernel/zephyr-kernel/zephyr-kernel-src-2.6.1.inc

@@ -50,4 +50,5 @@ SRC_URI:append = " \
     file://0001-cmake-add-yocto-toolchain.patch \
     file://0001-x86-fix-efi-binary-generation-issue-in-cross-compila.patch \
     file://arduino-nano-33-ble-storage-partition.patch \
+    file://dtc.patch \
 "