CHROMIUM: add boot-to-device mapper support.

init/do_mounts.c

 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/ctype.h>
 #include <linux/fd.h>
 #include <linux/tty.h>
 #include <linux/suspend.h>
 #include <linux/root_dev.h>
 #include <linux/security.h>
 #include <linux/delay.h>
 #include <linux/genhd.h>
@@ skipping 367 matching lines @@
          *
          * Note: this is a potential source of long boot delays.
          * For example, it is not atypical to wait 5 seconds here
          * for the touchpad of a laptop to initialize.
          */
         wait_for_device_probe();
 #endif
         async_synchronize_full();
 
         md_run_setup();
+        dm_run_setup();
 
         if (saved_root_name[0]) {
                 root_device_name = saved_root_name;
                 if (!strncmp(root_device_name, "mtd", 3) ||
                     !strncmp(root_device_name, "ubi", 3)) {
                         mount_block_root(root_device_name, root_mountflags);
                         goto out;
                 }
                 ROOT_DEV = name_to_dev_t(root_device_name);
                 if (strncmp(root_device_name, "/dev/", 5) == 0)
@@ skipping 17 matching lines @@
 
         if (is_floppy && rd_doload && rd_load_disk(0))
                 ROOT_DEV = Root_RAM0;
 
         mount_root();
 out:
         devtmpfs_mount("dev");
         sys_mount(".", "/", NULL, MS_MOVE, NULL);
         sys_chroot(".");
 }