COMMON: Use __stringify() instead of MK_STR()

Kill multiple occurances and redeclaration of MK_STR
in favor of __stringify().

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/include/configs/blackvme.h b/include/configs/blackvme.h
index f2dc6aa..523c4e4 100644
--- a/include/configs/blackvme.h
+++ b/include/configs/blackvme.h
@@ -184,10 +184,10 @@
  */
 #define CONFIG_BOOTARGS \
 	"root=/dev/mtdblock0 rw " \
-	"clkin_hz=" MK_STR(CONFIG_CLKIN_HZ) " " \
+	"clkin_hz=" __stringify(CONFIG_CLKIN_HZ) " " \
 	"earlyprintk=serial,uart0," \
-	MK_STR(CONFIG_BAUDRATE) " " \
-	"console=ttyBF0," MK_STR(CONFIG_BAUDRATE) " "
+	__stringify(CONFIG_BAUDRATE) " " \
+	"console=ttyBF0," __stringify(CONFIG_BAUDRATE) " "
 
 /* Convenience env variables & commands.
  * Reserve kernstart = 0x20000  = 128 kB for U-Boot.