ext4: remove ext4_inline_data_fiemap() declaration

ext4_inline_data_fiemap() has been removed since
commit d3b6f23f ("ext4: move ext4_fiemap to use iomap framework"),
so remove it.

Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Link: https://lore.kernel.org/r/20220909065307.1155201-1-cuigaosheng1@huawei.com


Signed-off-by: Theodore Ts'o <tytso@mit.edu>