Remove CONFIG_SPL_STACK_SIZE

This is not used anywhere, drop it.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/microblaze-generic.h b/include/configs/microblaze-generic.h
index e9c9bf9..389da11 100644
--- a/include/configs/microblaze-generic.h
+++ b/include/configs/microblaze-generic.h
@@ -128,7 +128,4 @@
 /* BRAM size - will be generated */
 #define CONFIG_SYS_INIT_RAM_SIZE	0x100000
 
-/* Just for sure that there is a space for stack */
-#define CONFIG_SPL_STACK_SIZE		0x100
-
 #endif	/* __CONFIG_H */