rockchip/rk3399: Cleanup platform.mk file

This makes the file consistently use tabs instead of mixing in spaces.
Signed-off-by: Derek Basehore <dbasehore@chromium.org>

plat/rockchip/rk3399/platform.mk

@@ -80,9 +80,9 @@ BL31_SOURCES            +=      ${RK_GIC_SOURCES}
 			${RK_PLAT_SOC}/drivers/pwm/pwm.c		\
 			${RK_PLAT_SOC}/drivers/soc/soc.c		\
 			${RK_PLAT_SOC}/drivers/dram/dfs.c		\
-                                ${RK_PLAT_SOC}/drivers/dram/suspend.c           \
 			${RK_PLAT_SOC}/drivers/dram/dram.c		\
-				${RK_PLAT_SOC}/drivers/dram/dram_spec_timing.c
+			${RK_PLAT_SOC}/drivers/dram/dram_spec_timing.c	\
+			${RK_PLAT_SOC}/drivers/dram/suspend.c
 
 ENABLE_PLAT_COMPAT	:=	0