watchdog: add Axxia watchdog driver for axxiaarm64

commit d146d5d4

 from
https://github.com/axxia/linux-yocto.git v5.10/standard/axxia-dev/base.

This commit adds Axxia watchdog driver as taken from
https://github.com/axxia/axxia_support/tree/master/linux/datalogger

MD5sum for the patch used as base is :
9cb400376100d06ae798ddaa543cbb10  0001-datalogger-The-Axxia-Test-Case.patch

Axxia sp804 watchdog driver fix taken from
https://github.com/axxia/axxia_support/tree/master/linux/datalogger/linux_4.19_patches

Signed-off-by: Per Hallsmark <per.hallsmark@windriver.com>
Signed-off-by: Anders Roxell <anders.roxell@gmail.com>
(cherry picked from commit 9dc42bca298aabba5f625a70d70ffaaedcf32b56)
Signed-off-by: Fredrik Gustavsson <fredrik.gustavsson@windriver.com>
Signed-off-by: Daniel Dragomir <Daniel.Dragomir@windriver.com>
Signed-off-by: John Jacques <john.jacques@intel.com>
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>
Signed-off-by: Liwei Song <liwei.song@windriver.com>