Switch to fs_mgr_read_fstab("/fstab.device")

fstab.device is for backward compatibility in legacy devices.
As it doesn't have fstab entries in device tree (for early mount) so we
can just use the ordinary fs_mgr_read_fstab().

For new devices having early mount, it should use
fs_mgr_read_fstab_default() instead.

Bug: 35811655
Test: adb reboot sideload && adb sideload ota.zip

Change-Id: I00b56a39747ab46d0e87da3c79b9f9faf0d1daef
(cherry picked from commit eb895c900198d4b48b606c2184203ec8d0310764)
diff --git a/utils_android.cc b/utils_android.cc
index bda7337..38d62ea 100644
--- a/utils_android.cc
+++ b/utils_android.cc
@@ -32,7 +32,7 @@
   if (fstab != nullptr)
     return fstab;
 
-  fstab = fs_mgr_read_fstab_with_dt("/fstab.device");
+  fstab = fs_mgr_read_fstab("/fstab.device");
   return fstab;
 }