rockchip: dts: rk3399: rockpro64: Use LPDDR4-100 dtsi

Use LPDDR4-100 sdram timings dtsi for Rockpro64 board.

All these timings are processed during TPL stage of rockpro64 board,
bootchain. This make TPL would replace rockchip in house rkbin in
current bootchain.

Bootchain after and before this change:

   TPL -> SPL -> U-Boot proper

 rkbin -> SPL -> U-Boot proper

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi b/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi
index 50b0ca0..f7f26d5 100644
--- a/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi
+++ b/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi
@@ -4,6 +4,7 @@
  */
 
 #include "rk3399-u-boot.dtsi"
+#include "rk3399-sdram-lpddr4-100.dtsi"
 
 &vdd_log {
 	regulator-init-microvolt = <950000>;