arm64: zynqmp: Enable ISSI flash for some platforms

Enable ISSI flash for platforms. Xilinx reference boards are also used
internally with different flash part to increase coverage that's why
enable also ISSI parts for all these boards even if that board is
released only with one part.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/xilinx_zynqmp_zcu106_revA_defconfig b/configs/xilinx_zynqmp_zcu106_revA_defconfig
index b7b0762..4df75f0 100644
--- a/configs/xilinx_zynqmp_zcu106_revA_defconfig
+++ b/configs/xilinx_zynqmp_zcu106_revA_defconfig
@@ -70,6 +70,7 @@
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_BAR=y
 CONFIG_SF_DUAL_FLASH=y
+CONFIG_SPI_FLASH_ISSI=y
 CONFIG_SPI_FLASH_MACRONIX=y
 CONFIG_SPI_FLASH_SPANSION=y
 CONFIG_SPI_FLASH_STMICRO=y