ext4: move dax and encrypt checking into ext4_check_feature_compatibility()

These checkings are also related with feature compatibility checkings.
So move them into ext4_check_feature_compatibility(). No functional
change.

Signed-off-by: Jason Yan <yanaijie@huawei.com>
Link: https://lore.kernel.org/r/20230323140517.1070239-9-yanaijie@huawei.com


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