添加 hw_reg_api.h 相关注释

build/build_dtest_kl3.sh

@@ -32,9 +32,9 @@ export dtest_only=1
 set -o errexit
 
 if [ "${CLEANUP_OPT}" == "1" ]; then
-    make -C .. clobber
-    make -C .. dtest_clean
+    make -j -C .. clobber
+    make -j -C .. dtest_clean
 fi
 
 # build kl3 dtest
-make -C .. dtest opt_build=1
+make -j -C .. dtest opt_build=1