erofs: drop experimental warning for FSDAX

As EXT4/XFS filesystems, FSDAX functionality is considered to be stable.
Let's drop this warning.
Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240325005116.106351-1-hsiangkao@linux.alibaba.com

fs/erofs/super.c

@@ -430,7 +430,6 @@ static bool erofs_fc_set_dax_mode(struct fs_context *fc, unsigned int mode)
 
 	switch (mode) {
 	case EROFS_MOUNT_DAX_ALWAYS:
-		warnfc(fc, "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
 		set_opt(&ctx->opt, DAX_ALWAYS);
 		clear_opt(&ctx->opt, DAX_NEVER);
 		return true;