ARM64: zynqmp: Enable SPI_FLASH and FLASH_BAR for ep108

Add missing SPI flash options.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/xilinx_zynqmp_ep_defconfig b/configs/xilinx_zynqmp_ep_defconfig
index dbf4906..903dc48 100644
--- a/configs/xilinx_zynqmp_ep_defconfig
+++ b/configs/xilinx_zynqmp_ep_defconfig
@@ -44,6 +44,8 @@
 CONFIG_DM_MMC=y
 CONFIG_ZYNQ_SDHCI=y
 CONFIG_NAND_ARASAN=y
+CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_BAR=y
 CONFIG_DM_ETH=y
 CONFIG_ZYNQ_GEM=y
 CONFIG_DEBUG_UART=y