This patch reverts the commit cab8f4b5.
InnoDB fails to restore page0 from doublewrite buffer when the
tablespace is being deferred. In that case, InnoDB doesn't find
INIT_PAGE redo log record for page0 and it leads to failure.
InnoDB should recovery page0 from doublewrite buffer for the
deferred tablespace before applying the redo log records.

Added deferred_dblwr() to restore page0 of deferred tablespace
from doublewrite buffer