ARM: zynq: Convert Antminer to OF_SEPARATE

Convert board from OF_EMBED to OF_SEPARATE.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

configs/bitmain_antminer_s9_defconfig

@@ -42,7 +42,6 @@ CONFIG_CMD_EXT4=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
-CONFIG_OF_EMBED=y
 CONFIG_DEFAULT_DEVICE_TREE="bitmain-antminer-s9"
 CONFIG_ENV_IS_IN_NAND=y
 CONFIG_NET_RANDOM_ETHADDR=y