Use __stringify() instead of xstr()

Some boards still use xstr(). Replace remaining occurrences
of xstr() by commonly used __stringify().

Signed-off-by: Anatolij Gustschin <agust@denx.de>
diff --git a/include/configs/o2d.h b/include/configs/o2d.h
index eff1bce..b2905b2 100644
--- a/include/configs/o2d.h
+++ b/include/configs/o2d.h
@@ -43,8 +43,8 @@
 
 #define CONFIG_BOARD_NAME		"o2d"
 #define CONFIG_BOARD_BOOTCMD		"run dhcp_boot"
-#define CONFIG_BOARD_MEM_LIMIT		xstr(126)
-#define BOARD_POST_CRC32_END		xstr(0x01000000)
+#define CONFIG_BOARD_MEM_LIMIT		__stringify(126)
+#define BOARD_POST_CRC32_END		__stringify(0x01000000)
 
 #define CONFIG_EXTRA_ENV_SETTINGS					\
 	CONFIG_IFM_DEFAULT_ENV_SETTINGS					\
@@ -56,7 +56,7 @@
 	"ramtop=fc55ffff\0"						\
 	"jffbot=fc560000\0"						\
 	"jfftop=fcffffff\0"						\
-	"ubobot=" xstr(CONFIG_SYS_FLASH_BASE) "\0"			\
+	"ubobot=" __stringify(CONFIG_SYS_FLASH_BASE) "\0"		\
 	"ubotop=fc03ffff\0"						\
 	"kernel_addr=0xfc060000\0"					\
 	"ramdisk_addr=0xfc160000\0"					\