arm: mvebu: Replace hardcoded values 0x0030/0x4030 by proper calculation

These hardcoded values were calculated from CONFIG_SPL_TEXT_BASE macro. Now
this macro is configurable via Kconfig, so calculate values 0x0030/0x4030
at compile time via CONFIG_SPL_TEXT_BASE option. Values 0x0030/0x4030
represents offset of CONFIG_SPL_TEXT_BASE from address 0x40000000.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/db-mv784mp-gp.h b/include/configs/db-mv784mp-gp.h
index dbbc33e..449a567 100644
--- a/include/configs/db-mv784mp-gp.h
+++ b/include/configs/db-mv784mp-gp.h
@@ -59,7 +59,7 @@
 
 /* SPL */
 /* Defines for SPL */
-#define CONFIG_SPL_MAX_SIZE		((128 << 10) - 0x4030)
+#define CONFIG_SPL_MAX_SIZE		((128 << 10) - (CONFIG_SPL_TEXT_BASE - 0x40000000))
 
 #define CONFIG_SPL_BSS_START_ADDR	(0x40000000 + (128 << 10))
 #define CONFIG_SPL_BSS_MAX_SIZE		(16 << 10)