rockchip: rk3399: Use tFC value instead of tRFC value

This fixes code that set a tFC value in a register using the tRFC
value instead.

Signed-off-by: Derek Basehore <dbasehore@chromium.org>
diff --git a/plat/rockchip/rk3399/drivers/dram/dfs.c b/plat/rockchip/rk3399/drivers/dram/dfs.c
index 98ecd51..f589a8a 100644
--- a/plat/rockchip/rk3399/drivers/dram/dfs.c
+++ b/plat/rockchip/rk3399/drivers/dram/dfs.c
@@ -1183,7 +1183,8 @@
 		mmio_clrsetbits_32(PI_REG(i, 148), 0xffff << 16,
 				   pdram_timing->mr[2] << 16);
 		/* PI_156 PI_TFC_F0:RW:0:10 */
-		mmio_clrsetbits_32(PI_REG(i, 156), 0x3ff, pdram_timing->trfc);
+		mmio_clrsetbits_32(PI_REG(i, 156), 0x3ff,
+				   pdram_timing->tfc_long);
 		/* PI_158 PI_TWR_F0:RW:24:6 */
 		mmio_clrsetbits_32(PI_REG(i, 158), 0x3f << 24,
 				   pdram_timing->twr << 24);
@@ -1363,7 +1364,7 @@
 		mmio_clrsetbits_32(PI_REG(i, 151), 0xffff, pdram_timing->mr[2]);
 		/* PI_156 PI_TFC_F1:RW:16:10 */
 		mmio_clrsetbits_32(PI_REG(i, 156), 0x3ff << 16,
-				   pdram_timing->trfc << 16);
+				   pdram_timing->tfc_long << 16);
 		/* PI_162 PI_TWR_F1:RW:8:6 */
 		mmio_clrsetbits_32(PI_REG(i, 162), 0x3f << 8,
 				   pdram_timing->twr << 8);