ARM: zynq: Choose boot image based on OF_SEPARATE macro

OF_CONTROL is enabled by default for all Zynq boards.
The difference between two boot images is done by OF_SEPARATE
or OF_EMBED macros.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/configs/zynq-common.h

@@ -331,7 +331,7 @@
 #define CONFIG_SYS_MMCSD_FS_BOOT_PARTITION     1
 #define CONFIG_SPL_LIBDISK_SUPPORT
 #define CONFIG_SPL_FAT_SUPPORT
-#ifdef CONFIG_OF_CONTROL
+#ifdef CONFIG_OF_SEPARATE
 # define CONFIG_SPL_FS_LOAD_PAYLOAD_NAME     "u-boot-dtb.img"
 #else
 # define CONFIG_SPL_FS_LOAD_PAYLOAD_NAME     "u-boot.img"