tools: acrn-crashlog: replace debugfs with api

Replace debugfs with api in loop.c.
There is no functional change.

Signed-off-by: Liu, Xinwu <xinwu.liu@intel.com>
Acked-by: Chen Gang <gang.c.chen@intel.com>

tools/acrn-crashlog/common/include/cmdutils.h

@@ -4,6 +4,5 @@
  */
 
 int execv_out2file(char * const argv[], const char *outfile);
-int debugfs_cmd(const char *loop_dev, const char *cmd, const char *outfile);
 int exec_out2file(const char *outfile, const char *fmt, ...);
 char *exec_out2mem(const char *fmt, ...);