rockchip: Break out common dram code for rk3399

This renames dram.c and dram.h to dfs.c and dfs.h respectively. This
is to make room for common functionality between frequency scaling and
suspend code for the DRAM in a pair of common files named dram.c and
dram.h. It also removes a duplicate enum definition from
dram_spec_timing.h

Change-Id: Ibfa1041f8781401f9d27901fe8c61862bcb05562
Signed-off-by: Derek Basehore <dbasehore@chromium.org>
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
diff --git a/plat/rockchip/rk3399/plat_sip_calls.c b/plat/rockchip/rk3399/plat_sip_calls.c
index a20ee2d..dfda6da 100644
--- a/plat/rockchip/rk3399/plat_sip_calls.c
+++ b/plat/rockchip/rk3399/plat_sip_calls.c
@@ -29,7 +29,7 @@
 #include <plat_sip_calls.h>
 #include <rockchip_sip_svc.h>
 #include <runtime_svc.h>
-#include <dram.h>
+#include <dfs.h>
 
 #define RK_SIP_DDR_CFG		0x82000008
 #define DRAM_INIT		0x00
@@ -45,7 +45,7 @@
 {
 	switch (id) {
 	case DRAM_INIT:
-		ddr_init();
+		ddr_dfs_init();
 		break;
 	case DRAM_SET_RATE:
 		return ddr_set_rate((uint32_t)arg0);