camera2 vndk: Improve error handling

Check for binder status when removing the camera
service listener.
Additionally check for any invalid extended availability
callbacks.

Bug: 247615866
Test: adb shell
/data/nativetest64/vendor/ACameraNdkVendorTest/ACameraNdkVendorTest

Change-Id: Ia043934288d8c5e5584034a08de24c998468039d