rockchip: rk3399: add dram driver
add dram driver, and kernel can through sip function talk to bl31 to
do ddr frequency scaling. and ddr auto powerdown.
Change-Id: I0d0f2869aed95e336c6e23ba96a9310985c84840
diff --git a/plat/rockchip/rk3399/drivers/dram/dcf_code.inc b/plat/rockchip/rk3399/drivers/dram/dcf_code.inc
new file mode 100644
index 0000000..53196a0
--- /dev/null
+++ b/plat/rockchip/rk3399/drivers/dram/dcf_code.inc
@@ -0,0 +1,364 @@
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