Use ftl::Flags for InputReaderConfiguration::Change

Convert the config flags into an enum class and use ftl::Flags when
dealing with configuration changes.

Bug: 245989146
Test: Presubmit
Change-Id: I0aed947ce433a1def11a60e73a14575561374700
diff --git a/services/inputflinger/reader/mapper/KeyboardInputMapper.h b/services/inputflinger/reader/mapper/KeyboardInputMapper.h
index 25fad57..bd27383 100644
--- a/services/inputflinger/reader/mapper/KeyboardInputMapper.h
+++ b/services/inputflinger/reader/mapper/KeyboardInputMapper.h
@@ -33,7 +33,7 @@
     void dump(std::string& dump) override;
     [[nodiscard]] std::list<NotifyArgs> reconfigure(nsecs_t when,
                                                     const InputReaderConfiguration& config,
-                                                    uint32_t changes) override;
+                                                    ConfigurationChanges changes) override;
     [[nodiscard]] std::list<NotifyArgs> reset(nsecs_t when) override;
     [[nodiscard]] std::list<NotifyArgs> process(const RawEvent* rawEvent) override;