rasdaemon: add support for memory_failure events

rasdaemon: add support for memory_failure events

Add support to log the memory_failure kernel trace
events.

Example rasdaemon log and SQLite DB output for the
memory_failure event,
=================================================
rasdaemon: memory_failure_event store: 0x126ce8f8
rasdaemon: register inserted at db
<...>-785   [000]     0.000024: memory_failure_event: 2020-10-02 13:27:13 -0400 pfn=0x204000000 page_type=free buddy page action_result=Delayed

CREATE TABLE memory_failure_event (id INTEGER PRIMARY KEY, timestamp TEXT, pfn TEXT, page_type TEXT, action_result TEXT);
INSERT INTO memory_failure_event VALUES(1,'2020-10-02 13:27:13 -0400','0x204000000','free buddy page','Delayed');
==================================================

Signed-off-by: Shiju Jose <shiju.jose@huawei.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>