enable large block device support

target/linux/kernel.config

@@ -19,6 +19,7 @@ CONFIG_PROC_FS=y
 CONFIG_PROC_SYSCTL=y
 CONFIG_BLOCK=y
 CONFIG_BLK_DEV=y
+CONFIG_LBDAF=y
 CONFIG_FILE_LOCKING=y
 CONFIG_SYSFS=y
 CONFIG_TMPFS=y