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/ExternalStylusInputMapper.cpp b/services/inputflinger/reader/mapper/ExternalStylusInputMapper.cpp
index 7100f88..987d2d0 100644
--- a/services/inputflinger/reader/mapper/ExternalStylusInputMapper.cpp
+++ b/services/inputflinger/reader/mapper/ExternalStylusInputMapper.cpp
@@ -49,7 +49,7 @@
 
 std::list<NotifyArgs> ExternalStylusInputMapper::reconfigure(nsecs_t when,
                                                              const InputReaderConfiguration& config,
-                                                             uint32_t changes) {
+                                                             ConfigurationChanges changes) {
     getAbsoluteAxisInfo(ABS_PRESSURE, &mRawPressureAxis);
     mTouchButtonAccumulator.configure();
     return {};