dts: Move dts.cmake to cmake/

Move the DTS CMake file to the cmake/ folder, where all other .cmake
files live.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>

cmake/app/boilerplate.cmake

@@ -240,7 +240,7 @@ include(${ZEPHYR_BASE}/cmake/toolchain.cmake)
 # running DTS involves running the preprocessor, so we put it behind
 # toolchain. Meaning toolchain.cmake is the only component where
 # kconfig and dts variables aren't available at the same time.
-include(${ZEPHYR_BASE}/dts/dts.cmake)
+include(${ZEPHYR_BASE}/cmake/dts.cmake)
 
 set(KERNEL_NAME ${CONFIG_KERNEL_BIN_NAME})