Fix clang-tidy warnings in bootable/recovery.

* Use const reference type for read-only parameters.
Bug: 30407689
* Use faster overloaded string find function.
Bug: 30411878
* Add parentheses around macro parameters.
Bug: 28705665

Test: build with WITH_TIDY=1
Change-Id: I4e8e5748bfa4ae89871f1fb5fa4624d372530d75

tests/component/applypatch_test.cpp

@@ -65,7 +65,7 @@ static bool file_cmp(std::string& f1, std::string& f2) {
     return c1 == c2;
 }
 
-static std::string from_testdata_base(const std::string fname) {
+static std::string from_testdata_base(const std::string& fname) {
     return android::base::StringPrintf("%s%s%s/%s",
             &DATA_PATH[0],
             &NATIVE_TEST_PATH[0],