ext4: don't hardcode bit values in EXT4_FL_USER_*

Define the EXT4_FL_USER_* constants by OR-ing together the appropriate
flags, rather than hard-coding a numeric value.  This makes it much
easier to see which flags are listed.

No change in the actual values.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20200713031012.192440-1-ebiggers@kernel.org


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