rockchip: clean up board_usb_init() for all SoCs

Use "snps,dwc2" for compatible name and and common variable
names so that we can share the common code for all SoCs.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/rk322x-board.c b/arch/arm/mach-rockchip/rk322x-board.c
index c0a5376..5103ad4 100644
--- a/arch/arm/mach-rockchip/rk322x-board.c
+++ b/arch/arm/mach-rockchip/rk322x-board.c
@@ -70,7 +70,7 @@
 #include <usb.h>
 #include <usb/dwc2_udc.h>
 
-static struct dwc2_plat_otg_data rk322x_otg_data = {
+static struct dwc2_plat_otg_data otg_data = {
 	.rx_fifo_sz	= 512,
 	.np_tx_fifo_sz	= 16,
 	.tx_fifo_sz	= 128,
@@ -85,7 +85,7 @@
 
 	/* find the usb_otg node */
 	node = fdt_node_offset_by_compatible(blob, -1,
-					"rockchip,rk3288-usb");
+					"snps,dwc2");
 
 	while (node > 0) {
 		mode = fdt_getprop(blob, node, "dr_mode", NULL);
@@ -95,15 +95,15 @@
 		}
 
 		node = fdt_node_offset_by_compatible(blob, node,
-					"rockchip,rk3288-usb");
+					"snps,dwc2");
 	}
 	if (!matched) {
 		debug("Not found usb_otg device\n");
 		return -ENODEV;
 	}
-	rk322x_otg_data.regs_otg = fdtdec_get_addr(blob, node, "reg");
+	otg_data.regs_otg = fdtdec_get_addr(blob, node, "reg");
 
-	return dwc2_udc_probe(&rk322x_otg_data);
+	return dwc2_udc_probe(&otg_data);
 }
 
 int board_usb_cleanup(int index, enum usb_init_type init)