InputMapper refactor: Change readerconfig pointer to const ref

We are refactoring Input-mapper to ensure they are configured at the
time of initialisation.

In this CL we are changing InputReaderConfiguration raw pointer to
a const reference and rename it to readerConfig for clarity.

Test: build, inputflinger_tests, presubmit checks

Bug: 256009910
Change-Id: Iae22c8cfba836bd311a51fca13d680456a61e604
diff --git a/services/inputflinger/reader/mapper/InputMapper.cpp b/services/inputflinger/reader/mapper/InputMapper.cpp
index 9d1e9ce..5dd7bc4 100644
--- a/services/inputflinger/reader/mapper/InputMapper.cpp
+++ b/services/inputflinger/reader/mapper/InputMapper.cpp
@@ -35,7 +35,7 @@
 
 void InputMapper::dump(std::string& dump) {}
 
-std::list<NotifyArgs> InputMapper::reconfigure(nsecs_t when, const InputReaderConfiguration* config,
+std::list<NotifyArgs> InputMapper::reconfigure(nsecs_t when, const InputReaderConfiguration& config,
                                                uint32_t changes) {
     return {};
 }