arm: zynq: Enable FPGA/FPGA_XILINX via Kconfig

Enabling fpga via Kconfig.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/syzygy_hub_defconfig b/configs/syzygy_hub_defconfig
index 544a31f..d25b48b 100644
--- a/configs/syzygy_hub_defconfig
+++ b/configs/syzygy_hub_defconfig
@@ -37,6 +37,7 @@
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_OF_EMBED=y
 CONFIG_SPL_DM_SEQ_ALIAS=y
+CONFIG_FPGA_XILINX=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_ZYNQ=y
 CONFIG_ZYNQ_GEM=y