rockchip/rk3399: use slice1 to restore ddr slice1 ~ slice4

we do not have enough pmusram space now, so use slice1 to restore
ddr slice1 ~ slice4, that's will save more pmusram space.

Change-Id: Id54a7944f33d01a8f244cee6a8a0707bfe4d42da
Signed-off-by: Lin Huang <hl@rock-chips.com>
diff --git a/plat/rockchip/rk3399/drivers/dram/dram.h b/plat/rockchip/rk3399/drivers/dram/dram.h
index fede7ee..0780fc3 100644
--- a/plat/rockchip/rk3399/drivers/dram/dram.h
+++ b/plat/rockchip/rk3399/drivers/dram/dram.h
@@ -25,10 +25,10 @@
 
 struct rk3399_ddr_publ_regs {
 	/*
-	 * PHY registers from 0 to 511.
-	 * Only registers 0-90 of each 128 register range are used.
+	 * PHY registers from 0 to 90 for slice1.
+	 * These are used to restore slice1-4 on resume.
 	 */
-	uint32_t phy0[4][91];
+	uint32_t phy0[91];
 	/*
 	 * PHY registers from 512 to 895.
 	 * Only registers 0-37 of each 128 register range are used.