Changed the fstab to support A/B boot implementation

BUG=25565537

Change-Id: Id72c6ea0baf330ce20fd5185c2127dfaafa8b064
diff --git a/fstab b/fstab
index 3b41b11..739ff4c 100644
--- a/fstab
+++ b/fstab
@@ -1,3 +1,4 @@
-/dev/block/platform/soc.2/d4200000.axi/d4281000.sdh/by-name/system     /system       ext4      rw                                                          wait,check
+/dev/block/platform/soc.2/d4200000.axi/d4281000.sdh/by-name/system     /system       ext4      rw                                                          wait,slotselect
 /dev/block/platform/soc.2/d4200000.axi/d4281000.sdh/by-name/userdata   /data         ext4      discard,noatime,nosuid,nodev,nomblk_io_submit,errors=panic  wait,check,encryptable=footer
 /dev/block/platform/soc.2/d4200000.axi/d4281000.sdh/by-name/cache      /cache        ext4      discard,noatime,nosuid,nodev,nomblk_io_submit,errors=panic  wait,check
+/dev/block/platform/soc.2/d4200000.axi/d4281000.sdh/by-name/misc       /misc         emmc      defaults                                            defaults