os/fs/driver/mtd : Modify journaling object structures
os/fs/driver/mtd : Modify journaling object structures

- change struct smart_journal_logging_data_s ->
  smart_journal_entry_s.
- change njournaldata -> njournalentries in struct
  smart_struct_s

Signed-off-by: Amogh Hassija <448175fdc113b17c725467b053a031f9134d1029@samsung.com>

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