erofs-utils: fix the project prefix to "erofs-utils"

Some of them were "erofs_utils" in source headers by mistake.

Link: https://lore.kernel.org/r/20201024100516.14759-1-hsiangkao@aol.com
Reviewed-by: Li Guifu <bluce.lee@aliyun.com>
Signed-off-by: Gao Xiang <hsiangkao@aol.com>
19 files changed