Print Motion/KeyEvent's eventId as a hex string

...to make it more readable while debugging, since it's a 32-bit random
number.

Bug: 210460522
Test: None
Change-Id: I223071a2d4c671c2cc91a49dd049c481ce4a2319

Author: prabirmsp

libs/input/Input.cpp

@@ -374,7 +374,7 @@ std::ostream& operator<<(std::ostream& out, const KeyEvent& event) {
     out << ", deviceId=" << event.getDeviceId();
     out << ", source=" << inputEventSourceToString(event.getSource());
     out << ", displayId=" << event.getDisplayId();
-    out << ", eventId=" << event.getId();
+    out << ", eventId=0x" << std::hex << event.getId() << std::dec;
     out << "}";
     return out;
 }
@@ -1051,7 +1051,7 @@ std::ostream& operator<<(std::ostream& out, const MotionEvent& event) {
     out << ", deviceId=" << event.getDeviceId();
     out << ", source=" << inputEventSourceToString(event.getSource());
     out << ", displayId=" << event.getDisplayId();
-    out << ", eventId=" << event.getId();
+    out << ", eventId=0x" << std::hex << event.getId() << std::dec;
     out << "}";
     return out;
 }