Fix clang-tidy performance warnings in syste/core.

* Use const reference type for parameters to avoid unnecessary copy.
* Suppress warning of not using faster overloaded string find function.

Bug: 30407689
Bug: 30411878
Change-Id: Ie79dbe21899867bc62031f8618bb1322b8071525
Test: build with WITH_TIDY=1
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index 5dde490..314ed42 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -969,7 +969,7 @@
 }
 
 static void do_for_partition(Transport* transport, const std::string& part, const std::string& slot,
-                             std::function<void(const std::string&)> func, bool force_slot) {
+                             const std::function<void(const std::string&)>& func, bool force_slot) {
     std::string has_slot;
     std::string current_slot;
 
@@ -1002,7 +1002,7 @@
  * partition does not support slots.
  */
 static void do_for_partitions(Transport* transport, const std::string& part, const std::string& slot,
-                              std::function<void(const std::string&)> func, bool force_slot) {
+                              const std::function<void(const std::string&)>& func, bool force_slot) {
     std::string has_slot;
 
     if (slot == "all") {