board: phytec: common: Introduce a method to inject DDR timings deltas

Introduce fdt_apply_ddrss_timings_patch() to allow board code to
override DDR settings in the device tree prior to DDRSS driver probing.

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Tested-by: John Ma <jma@phytec.com>
diff --git a/board/phytec/common/k3/Makefile b/board/phytec/common/k3/Makefile
index bcca1a9..40e91a4 100644
--- a/board/phytec/common/k3/Makefile
+++ b/board/phytec/common/k3/Makefile
@@ -1,2 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0+
 obj-y += board.o
+obj-$(CONFIG_K3_DDRSS) += k3_ddrss_patch.o