board: freescale: p1_p2_rdb_pc: Fix env $vscfw_addr

Do not stringify env $vscfw_addr two times (once implicitly via string
operator "" and second time explicitly via __stringify() macro) and allow
to compile U-Boot without CONFIG_VSC7385_ENET (when __VSCFW_ADDR was not
defined and so macro name was stringified into CONFIG_EXTRA_ENV_SETTINGS).

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/include/configs/p1_p2_rdb_pc.h b/include/configs/p1_p2_rdb_pc.h
index cc70330..c3df638 100644
--- a/include/configs/p1_p2_rdb_pc.h
+++ b/include/configs/p1_p2_rdb_pc.h
@@ -325,7 +325,7 @@
 
 /* Vsc7385 switch */
 #ifdef CONFIG_VSC7385_ENET
-#define __VSCFW_ADDR			"vscfw_addr=ef000000"
+#define __VSCFW_ADDR			"vscfw_addr=ef000000\0"
 #define CONFIG_SYS_VSC7385_BASE		0xffb00000
 
 #ifdef CONFIG_PHYS_64BIT
@@ -344,6 +344,10 @@
 #define CONFIG_VSC7385_IMAGE_SIZE	8192
 #endif
 
+#ifndef __VSCFW_ADDR
+#define __VSCFW_ADDR ""
+#endif
+
 /*
  * Config the L2 Cache as L2 SRAM
 */
@@ -581,7 +585,7 @@
 "ramdisk_size=120000\0"	\
 "map_lowernorbank=i2c dev 1; i2c mw 18 1 02 1; i2c mw 18 3 fd 1\0" \
 "map_uppernorbank=i2c dev 1; i2c mw 18 1 00 1; i2c mw 18 3 fd 1\0" \
-__stringify(__VSCFW_ADDR)"\0" \
+__VSCFW_ADDR	\
 __stringify(__NOR_RST_CMD)"\0" \
 __stringify(__SPI_RST_CMD)"\0" \
 __stringify(__SD_RST_CMD)"\0" \