test-case: check-sof-logger: rename ouput file

The web cannot identify '*.log' file
change output files  from *.log  to *.txt

Signed-off-by: Iris Wu <xiaoyun.wu@intel.com>

Author: XiaoyunWu6666

test-case/check-sof-logger.sh

@@ -53,8 +53,8 @@ ldcFile=$(find_ldc_file) || die ".ldc file not found!"
 
 dlogi "Found file: $(md5sum "$ldcFile"|awk '{print $2, $1;}')"
 
-data_file=$LOG_ROOT/logger.data.log
-error_file=$LOG_ROOT/logger.error.log
+data_file=$LOG_ROOT/logger.data.txt
+error_file=$LOG_ROOT/logger.error.txt
 
 func_lib_check_sudo