Let touch screen and joystick could be associated with the display

Currently, an input device could be associated with a display by the
specific port or uniqueId. But in TouchInputMapper and
JoystickInputMapper, it didn't aware that the InputDeivce already had
such association.
This CL will let them could assign the corresponding displayId.

Bug: 215631144
Test: atest inputflinger_tests
Change-Id: I6e1593998c6a397245856dcc708c5f192bcaa9bd