fs_mgr: removing fs_mgr_read_fstab_with_dt()

Currently there is no client requires fs_mgr_read_fstab_with_dt() so
remove this API. Devices with fstab entries in device tree should use
fs_mgr_read_fstab_default() to get default fstab, or just use
fs_mgr_read_fstab_dt() to get those in device tree.

Bug: 35811655
Test: normal boot sailfish
Test: run factory data reset in sailfish
Test: recovery boot sailfish
Test: adb sideload in sailfish

Change-Id: I1579d81cea7366cf3867cfe5ad56feb36cbb7246
(cherry picked from commit acc1c3c7929fcb6def72cc640ef26b4e9ce1b4b4)
diff --git a/fs_mgr/fs_mgr_fstab.cpp b/fs_mgr/fs_mgr_fstab.cpp
index 70b10e0..a9a0df7 100644
--- a/fs_mgr/fs_mgr_fstab.cpp
+++ b/fs_mgr/fs_mgr_fstab.cpp
@@ -671,17 +671,6 @@
     return fstab;
 }
 
-/* combines fstab entries passed in from device tree with
- * the ones found from fstab_path
- */
-struct fstab *fs_mgr_read_fstab_with_dt(const char *fstab_path)
-{
-    struct fstab *fstab_dt = fs_mgr_read_fstab_dt();
-    struct fstab *fstab = fs_mgr_read_fstab(fstab_path);
-
-    return in_place_merge(fstab_dt, fstab);
-}
-
 /*
  * tries to load default fstab.<hardware> file from /odm/etc, /vendor/etc
  * or /. loads the first one found and also combines fstab entries passed
@@ -704,7 +693,12 @@
         LWARNING << __FUNCTION__ << "(): failed to find device hardware name";
     }
 
-    return fs_mgr_read_fstab_with_dt(default_fstab.c_str());
+    // combines fstab entries passed in from device tree with
+    // the ones found from default_fstab file
+    struct fstab *fstab_dt = fs_mgr_read_fstab_dt();
+    struct fstab *fstab = fs_mgr_read_fstab(default_fstab.c_str());
+
+    return in_place_merge(fstab_dt, fstab);
 }
 
 void fs_mgr_free_fstab(struct fstab *fstab)
diff --git a/fs_mgr/include/fs_mgr.h b/fs_mgr/include/fs_mgr.h
index e5f2699..2fd5f65 100644
--- a/fs_mgr/include/fs_mgr.h
+++ b/fs_mgr/include/fs_mgr.h
@@ -89,7 +89,6 @@
 struct fstab *fs_mgr_read_fstab_default();
 struct fstab *fs_mgr_read_fstab_dt();
 struct fstab *fs_mgr_read_fstab(const char *fstab_path);
-struct fstab *fs_mgr_read_fstab_with_dt(const char *fstab_path);
 void fs_mgr_free_fstab(struct fstab *fstab);
 
 #define FS_MGR_MNTALL_DEV_FILE_ENCRYPTED 5