arch: arm64: add support for coredump

* Add support for coredump on ARM64 architectures.
* Add the script used for post-processing coredump output.

Signed-off-by: Marcelo Ruaro <marcelo.ruaro@huawei.com>
Signed-off-by: Rodrigo Cataldo <rodrigo.cataldo@huawei.com>
Signed-off-by: Roberto Medina <roberto.medina@huawei.com>