board: atmel: sama7g5ek: add SYS_MALLOC_F_LEN to SYS_INIT_SP_ADDR

Heap base address is computed based on SYS_INIT_SP_ADDR by
subtracting the SYS_MALLOC_F_LEN value in
board_init_f_init_reserve().

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
diff --git a/include/configs/sama7g5ek.h b/include/configs/sama7g5ek.h
index 3b3432b..fbf0274 100644
--- a/include/configs/sama7g5ek.h
+++ b/include/configs/sama7g5ek.h
@@ -20,7 +20,8 @@
 #define CONFIG_SYS_INIT_SP_ADDR		0x218000
 #else
 #define CONFIG_SYS_INIT_SP_ADDR \
-	(CONFIG_SYS_SDRAM_BASE + 16 * 1024 - GENERATED_GBL_DATA_SIZE)
+	(CONFIG_SYS_SDRAM_BASE + 16 * 1024 + CONFIG_SYS_MALLOC_F_LEN - \
+	 GENERATED_GBL_DATA_SIZE)
 #endif
 
 #define CONFIG_SYS_LOAD_ADDR		0x62000000 /* load address */