erofs: clean up file headers & footers

 - Remove my outdated misleading email address;

 - Get rid of all unnecessary trailing newline by accident.

Link: https://lore.kernel.org/r/20210602160634.10757-1-xiang@kernel.org


Reviewed-by: Chao Yu <yuchao0@huawei.com>
Change-Id: Ia79083527a29f888c8c1e5c2cf6247a61cb86eb0
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>