Add dump to Input Classifier

Currently, the InputClassifier stage that is positioned between
InputReader and InputDispatcher is not accounted for when doing a
'dumpsys input'. But that stage may contain important information about
the operation and the InputClassifier HAL. Add the dump(..) command to
both InputClassifier and MotionClassifier.

Test: dumpsys input and inspect the resulting text
Next, crash the InputClassifier HAL (killall android.hardware.input.classifier@1.0-service
Then again 'dumpsys input' to check that the HAL status is 'not
responding'
Bug: 117935272
Change-Id: Ie7ddca2e355e094f93236a9bc667faad7a99ee70
diff --git a/services/inputflinger/InputManager.cpp b/services/inputflinger/InputManager.cpp
index b3b9e3e..a7fd9ba 100644
--- a/services/inputflinger/InputManager.cpp
+++ b/services/inputflinger/InputManager.cpp
@@ -84,6 +84,10 @@
     return mReader;
 }
 
+sp<InputClassifierInterface> InputManager::getClassifier() {
+    return mClassifier;
+}
+
 sp<InputDispatcherInterface> InputManager::getDispatcher() {
     return mDispatcher;
 }