arm64: zynqmp: Disable MMC for for zc12xx_revA boards

All these boards have no SD enabled.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/xilinx_zynqmp_zc1275_revA_defconfig b/configs/xilinx_zynqmp_zc1275_revA_defconfig
index f76d580..7d2bd2e 100644
--- a/configs/xilinx_zynqmp_zc1275_revA_defconfig
+++ b/configs/xilinx_zynqmp_zc1275_revA_defconfig
@@ -32,11 +32,11 @@
 CONFIG_OF_EMBED=y
 CONFIG_DEFAULT_DEVICE_TREE="zynqmp-zc1275-revA"
 CONFIG_SPL_DM=y
-# CONFIG_BLK is not set
 CONFIG_CLK_ZYNQMP=y
 CONFIG_FPGA_XILINX=y
 CONFIG_FPGA_ZYNQMPPL=y
 CONFIG_MISC=y
+# CONFIG_MMC is not set
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_BAR=y
 CONFIG_SF_DUAL_FLASH=y