rockchip: dts: rk3399-puma: refactor and rename (default) DDR3-1600 DTS

To better support different RAM timings (DDR3-1333 and DDR3-1866 are
assembly options for the RK3399-Q7), this refactors the DTS support
and renames the default DTS variant from rk3399-puma to
rk3399-puma-ddr1600:
- changes the rk3399-puma DTS into a board-specific DTSI by removing
  the inclusion of the DRAM timings
- adds a new rk3399-puma-ddr1600.dts, which includes the (new) common
  board DTSI and the DDR3-1600 timing DTSI
- wires this up from arch/arm/dts/Makefile and configs/puma-rk3399_defconfig

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Simon Glass <sjg@chromium.org>

arch/arm/dts/Makefile

@@ -46,7 +46,7 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += \
 	rk3368-px5-evb.dtb \
 	rk3399-evb.dtb \
 	rk3399-firefly.dtb \
-	rk3399-puma.dtb \
+	rk3399-puma-ddr1600.dtb \
 	rv1108-evb.dtb
 dtb-$(CONFIG_ARCH_MESON) += \
 	meson-gxbb-odroidc2.dtb

arch/arm/dts/rk3399-puma-ddr1600.dts

@@ -0,0 +1,11 @@
+/*
+ * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
+ *
+ * SPDX-License-Identifier:     GPL-2.0+	X11
+ */
+
+/dts-v1/;
+
+#include "rk3399-puma.dtsi"
+#include "rk3399-sdram-ddr3-1600.dtsi"
+

arch/arm/dts/rk3399-puma.dtsi

@@ -4,11 +4,8 @@
  * SPDX-License-Identifier:     GPL-2.0+	X11
  */
 
-/dts-v1/;
-
 #include <dt-bindings/pwm/pwm.h>
 #include "rk3399.dtsi"
-#include "rk3399-sdram-ddr3-1600.dtsi"
 
 / {
 	model = "Theobroma Systems RK3399-Q7 SoM";

configs/puma-rk3399_defconfig

@@ -8,7 +8,7 @@ CONFIG_TARGET_PUMA_RK3399=y
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
 CONFIG_SPL_SPI_SUPPORT=y
 CONFIG_SPL_STACK_R_ADDR=0x80000
-CONFIG_DEFAULT_DEVICE_TREE="rk3399-puma"
+CONFIG_DEFAULT_DEVICE_TREE="rk3399-puma-ddr1600"
 CONFIG_DEBUG_UART=y
 CONFIG_FIT=y
 CONFIG_SPL_LOAD_FIT=y