tools: acrn-crashlog: Limit the log size of kmsg

Dmesg collects too much log when kernel meets log storm.
This patch reads kernel log from "/dev/kmsg" intead of dmesg and limits
the generated log size.

Tracked-On: #1024
Signed-off-by: Liu, Xinwu <xinwu.liu@intel.com>
Reviewed-by: Zhi Jin <zhi.jin@intel.com>
Acked-by: Chen, Gang <gang.c.chen@intel.com>

tools/acrn-crashlog/acrnprobe/include/load_conf.h

@@ -57,6 +57,8 @@ struct log_t {
 	size_t		path_len;
 	const char	*lines;
 	size_t		lines_len;
+	const char	*sizelimit;
+	size_t		sizelimit_len;
 
 	void (*get)(struct log_t *, void *);
 };