ext4: refactoring to use the unified helper ext4_quotas_off()

Rename ext4_quota_off_umount() to ext4_quotas_off(), and add type
parameter to replace open code in ext4_enable_quotas().

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230327141630.156875-3-libaokun1@huawei.com


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