ARM: zynq: Enable i2c mux support for all boards

zc702/zc706 have pca9548 i2c muxes that's why enable the driver by default.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/xilinx_zynq_virt_defconfig b/configs/xilinx_zynq_virt_defconfig
index 08b43de..76beea1 100644
--- a/configs/xilinx_zynq_virt_defconfig
+++ b/configs/xilinx_zynq_virt_defconfig
@@ -50,6 +50,8 @@
 CONFIG_FPGA_ZYNQPL=y
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_CADENCE=y
+CONFIG_I2C_MUX=y
+CONFIG_I2C_MUX_PCA954x=y
 CONFIG_LED=y
 CONFIG_LED_GPIO=y
 CONFIG_MISC=y