powerpc/p2020rdb: fix the FDT_ERR_NOTFOUND issue

Because the function ft_board_setup() delete the USB2 device node, it
leads to can't find the device node and hung up.

In fact only P1020RDB needs to delete the USB2 node, this patch fixes
this issue.

Signed-off-by: Ying Zhang <b40530@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c

@@ -428,8 +428,13 @@ int ft_board_setup(void *blob, bd_t *bd)
 {
 	phys_addr_t base;
 	phys_size_t size;
+#if defined(CONFIG_P1020RDB_PD) || defined(CONFIG_P1020RDB_PC)
 	const char *soc_usb_compat = "fsl-usb2-dr";
-	int err, usb1_off, usb2_off;
+	int usb_err, usb1_off, usb2_off;
+#endif
+#if defined(CONFIG_SDCARD) || defined(CONFIG_SPIFLASH)
+	int err;
+#endif
 
 	ft_cpu_setup(blob, bd);
 
@@ -473,6 +478,7 @@ int ft_board_setup(void *blob, bd_t *bd)
 	}
 #endif
 
+#if defined(CONFIG_P1020RDB_PD) || defined(CONFIG_P1020RDB_PC)
 /* Delete USB2 node as it is muxed with eLBC */
 	usb1_off = fdt_node_offset_by_compatible(blob, -1,
 		soc_usb_compat);
@@ -488,11 +494,12 @@ int ft_board_setup(void *blob, bd_t *bd)
 		       soc_usb_compat);
 		return usb2_off;
 	}
-	err = fdt_del_node(blob, usb2_off);
-	if (err < 0) {
+	usb_err = fdt_del_node(blob, usb2_off);
+	if (usb_err < 0) {
 		printf("WARNING: could not remove %s\n", soc_usb_compat);
-		return err;
+		return usb_err;
 	}
+#endif
 
 	return 0;
 }