rockchip: elgin-rv1108: Use syscon API to get grf base

Use syscon API to get grf base instead of get from dts.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Otavio Salvador <otavio@ossystems.com.br>
diff --git a/board/elgin/elgin_rv1108/elgin_rv1108.c b/board/elgin/elgin_rv1108/elgin_rv1108.c
index 607667a..06df25a 100644
--- a/board/elgin/elgin_rv1108/elgin_rv1108.c
+++ b/board/elgin/elgin_rv1108/elgin_rv1108.c
@@ -5,8 +5,9 @@
  */
 
 #include <common.h>
+#include <syscon.h>
 #include <asm/io.h>
-#include <fdtdec.h>
+#include <asm/arch-rockchip/clock.h>
 #include <asm/arch-rockchip/grf_rv1108.h>
 #include <asm/arch-rockchip/hardware.h>
 #include <asm/gpio.h>
@@ -15,7 +16,6 @@
 
 int mach_cpu_init(void)
 {
-	int node;
 	struct rv1108_grf *grf;
 	enum {
 		GPIO3C3_SHIFT           = 6,
@@ -35,8 +35,7 @@
 		GPIO2D1_UART2_SIN_M0,
 	};
 
-	node = fdt_node_offset_by_compatible(gd->fdt_blob, -1, "rockchip,rv1108-grf");
-	grf = (struct rv1108_grf *)fdtdec_get_addr(gd->fdt_blob, node, "reg");
+	grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
 
 	/* Elgin board use UART2 m0 for debug*/
 	rk_clrsetreg(&grf->gpio2d_iomux,