ce overwrite boot device from config.ini

overwrite boot device from /flash/config.ini
coreelec='quiet ce_boot_dev=usb=a'

ce_boot_dev=usb=a
ce_boot_dev=mmc=1

diff --git a/packages/sysutils/busybox/scripts/init b/packages/sysutils/busybox/scripts/init
index baad7344e9..8b310399a2 100755
--- a/packages/sysutils/busybox/scripts/init
+++ b/packages/sysutils/busybox/scripts/init
@@ -1221,6 +1221,26 @@ for arg in $(cat /proc/cmdline); do
           ;;
       esac
       ;;
+    ce_boot_dev=*)
+      case $ce_boot_dev in
+        usb=*)
+          ce_boot_dev="${arg#*=}"          # usb=a
+          ce_boot_dev="${ce_boot_dev#*=}"  # a
+          boot=/dev/sd${ce_boot_dev}1
+          disk=/dev/sd${ce_boot_dev}2
+          RUN_FSCK_DISKS="$boot $disk"
+          progress "ce_boot_dev: USB boot=$boot disk=$disk"
+          ;;
+        mmc=*)
+          ce_boot_dev="${arg#*=}"          # mmc=1
+          ce_boot_dev="${ce_boot_dev#*=}"  # 1
+          boot=/dev/mmcblk${ce_boot_dev}p1
+          disk=/dev/mmcblk${ce_boot_dev}p2
+          RUN_FSCK_DISKS="$boot $disk"
+          progress "ce_boot_dev: MMC boot=$boot disk=$disk"
+          ;;
+      esac
+      ;;
     wol_mac=*)
       wol_mac="${arg#*=}"
       ;;