x86: edison: Move config SYS_MALLOC_LEN to Kconfig

This patch moves the the config SYS_MALLOC_LEN to Kconfig
as it is already done for zynq arch in commit 01aa5b8f05
("Kconfig: Move config SYS_MALLOC_LEN to Kconfig for zynq").

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

board/intel/edison/Kconfig

@@ -12,6 +12,9 @@ config SYS_SOC
 config SYS_CONFIG_NAME
 	default "edison"
 
+config SYS_MALLOC_LEN
+	default 0x08000000
+
 config SYS_TEXT_BASE
 	default 0x01101000
 

include/configs/edison.h

@@ -23,10 +23,6 @@
 #define CONFIG_SYS_MONITOR_BASE			CONFIG_SYS_TEXT_BASE
 #define CONFIG_SYS_MONITOR_LEN			(256 * 1024)
 
-#define CONFIG_SYS_MALLOC_LEN			(128 * 1024 * 1024)
-
-/* Environment */
-
 /* RTC */
 #define CONFIG_SYS_ISA_IO_BASE_ADDRESS	0