ext4: cleanup unused CONVERT_INLINE_DATA flag

After implementing bitwise flags for tracking the inline data write
state in the address space fsdata parameter, the CONVERT_INLINE_DATA
state flag is left unused and can be removed.

Perform this clean-up by:
1) Deleting the CONVERT_INLINE_DATA definition from ext4.h.
2) Removing the void **fsdata argument from both the forward
   declaration and the definition of the internal helper
   ext4_da_convert_inline_data_to_extent().
3) Removing the void **fsdata argument from the declaration and
   definition of ext4_generic_write_inline_data() and updating
   the caller ext4_try_to_write_inline_data() and the internal
   re-alloc retry logic accordingly.
4) Updating ext4_da_write_begin() to call
   ext4_generic_write_inline_data() without the fsdata parameter.

Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Aditya Prakash Srivastava <aditya.ansh182@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260703045414.1768-2-aditya.ansh182@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

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