x86: Remove unused option

There is option which is not used:
	CONFIG_ZBOOT_32

Remove it from default x86 config and from whitelist.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>

include/configs/x86-common.h

@@ -16,7 +16,6 @@
  * (easy to change)
  */
 #define CONFIG_SHOW_BOOT_PROGRESS
-#define CONFIG_ZBOOT_32
 #define CONFIG_PHYSMEM
 #define CONFIG_DISPLAY_BOARDINFO_LATE
 #define CONFIG_LAST_STAGE_INIT

scripts/config_whitelist.txt

@@ -6663,7 +6663,6 @@ CONFIG_YAFFS_WINCE
 CONFIG_YELLOWSTONE
 CONFIG_YELLOW_LED
 CONFIG_YOSEMITE
-CONFIG_ZBOOT_32
 CONFIG_ZC770_XM010
 CONFIG_ZC770_XM011
 CONFIG_ZC770_XM012