arm: zynq: Enable BLK when needed

There is no reason to enable BLK by default for all boards which is just
increasing memory footprint for memory contrained boards like cse.
zc770s are also saving some space.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/zynq_cse_qspi_defconfig b/configs/zynq_cse_qspi_defconfig
index 9659fae..f6241cd 100644
--- a/configs/zynq_cse_qspi_defconfig
+++ b/configs/zynq_cse_qspi_defconfig
@@ -48,7 +48,6 @@
 # CONFIG_DM_WARN is not set
 # CONFIG_DM_DEVICE_REMOVE is not set
 CONFIG_SPL_DM_SEQ_ALIAS=y
-# CONFIG_SPL_BLK is not set
 # CONFIG_ZYNQ_GPIO is not set
 # CONFIG_MMC is not set
 CONFIG_SPI_FLASH=y
diff --git a/configs/zynq_zc770_xm011_defconfig b/configs/zynq_zc770_xm011_defconfig
index 2f1205a..e350ae0 100644
--- a/configs/zynq_zc770_xm011_defconfig
+++ b/configs/zynq_zc770_xm011_defconfig
@@ -28,6 +28,7 @@
 # CONFIG_CMD_NFS is not set
 CONFIG_CMD_CACHE=y
 CONFIG_SPL_DM_SEQ_ALIAS=y
+CONFIG_BLK=y
 CONFIG_FPGA_XILINX=y
 # CONFIG_MMC is not set
 CONFIG_NAND=y
diff --git a/configs/zynq_zc770_xm012_defconfig b/configs/zynq_zc770_xm012_defconfig
index 3893780..2ec53c3 100644
--- a/configs/zynq_zc770_xm012_defconfig
+++ b/configs/zynq_zc770_xm012_defconfig
@@ -30,6 +30,7 @@
 CONFIG_ENV_IS_IN_FLASH=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_SPL_DM_SEQ_ALIAS=y
+CONFIG_BLK=y
 CONFIG_FPGA_XILINX=y
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
diff --git a/configs/zynq_zc770_xm013_defconfig b/configs/zynq_zc770_xm013_defconfig
index 6e9c957..08f8ade 100644
--- a/configs/zynq_zc770_xm013_defconfig
+++ b/configs/zynq_zc770_xm013_defconfig
@@ -29,6 +29,7 @@
 CONFIG_CMD_CACHE=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_SPL_DM_SEQ_ALIAS=y
+CONFIG_BLK=y
 CONFIG_FPGA_XILINX=y
 # CONFIG_MMC is not set
 CONFIG_SPI_FLASH=y