arm: zynq: Remove OF_EMBED configuration for zc770 xm011 x16

Use appended dtb which is default option for zynq boards.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

configs/zynq_zc770_xm011_x16_defconfig

@@ -29,7 +29,6 @@ CONFIG_CMD_CACHE=y
 # CONFIG_SPL_DOS_PARTITION is not set
 # CONFIG_SPL_ISO_PARTITION is not set
 # CONFIG_SPL_EFI_PARTITION is not set
-CONFIG_OF_EMBED=y
 CONFIG_SPL_DM_SEQ_ALIAS=y
 CONFIG_FPGA_XILINX=y
 CONFIG_FPGA_ZYNQPL=y