watchdog: upgrade 5.15 -> 5.16

0001-Include-linux-param.h-for-EXEC_PAGESIZE-definition.patch
removed since it is included in 5.16

-License-Update: Copyright year updated to 2020.

Signed-off-by: Wang Mingyu <wangmy@cn.fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>