fs_mgr: removing __BEGIN_DECLS and __END_DECLS

fs_mgr isn't usable by C now as we've migrated all fs_mgr clients in AOSP
to CPP. Removing the support for C clients.

Bug: 67024518
Bug: 67444051
Test: boot sailfish

Change-Id: Iac57f51eb6a524c6dcdc625c83af75602b4f9b3b
diff --git a/fs_mgr/include/fs_mgr.h b/fs_mgr/include/fs_mgr.h
index 3d3faf3..5c26c2e 100644
--- a/fs_mgr/include/fs_mgr.h
+++ b/fs_mgr/include/fs_mgr.h
@@ -31,8 +31,6 @@
 // turn verity off in userdebug builds.
 #define VERITY_METADATA_MAGIC_DISABLE 0x46464f56 // "VOFF"
 
-__BEGIN_DECLS
-
 // Verity modes
 enum verity_mode {
     VERITY_MODE_EIO = 0,
@@ -85,6 +83,4 @@
 #define FS_MGR_SETUP_VERITY_SUCCESS 0
 int fs_mgr_setup_verity(struct fstab_rec *fstab, bool wait_for_verity_dev);
 
-__END_DECLS
-
 #endif /* __CORE_FS_MGR_H */
diff --git a/fs_mgr/include_fstab/fstab/fstab.h b/fs_mgr/include_fstab/fstab/fstab.h
index ef51724..bc2942d 100644
--- a/fs_mgr/include_fstab/fstab/fstab.h
+++ b/fs_mgr/include_fstab/fstab/fstab.h
@@ -22,13 +22,7 @@
 #include <stdint.h>
 #include <stdio.h>
 
-// C++ only headers
-// TODO: move this into separate header files under include/fs_mgr/*.h
-#ifdef __cplusplus
 #include <string>
-#endif
-
-__BEGIN_DECLS
 
 /*
  * The entries must be kept in the same order as they were seen in the fstab.
@@ -70,6 +64,7 @@
 
 int fs_mgr_add_entry(struct fstab* fstab, const char* mount_point, const char* fs_type,
                      const char* blk_device);
+struct fstab_rec* fs_mgr_get_entry_for_mount_point(struct fstab* fstab, const std::string& path);
 int fs_mgr_is_voldmanaged(const struct fstab_rec* fstab);
 int fs_mgr_is_nonremovable(const struct fstab_rec* fstab);
 int fs_mgr_is_verified(const struct fstab_rec* fstab);
@@ -88,13 +83,6 @@
 int fs_mgr_is_latemount(const struct fstab_rec* fstab);
 int fs_mgr_is_quota(const struct fstab_rec* fstab);
 
-__END_DECLS
-
-// C++ only functions
-// TODO: move this into separate header files under include/fs_mgr/*.h
-#ifdef __cplusplus
 std::string fs_mgr_get_slot_suffix();
-struct fstab_rec* fs_mgr_get_entry_for_mount_point(struct fstab* fstab, const std::string& path);
-#endif
 
 #endif /* __CORE_FS_TAB_H */