libbinder_ndk: ibinder.cpp explicit errors

You know when you're writing an error message and you're like
ughhhhhh so much work for a couple extra chars that probably won't
matter, and we can make the error useful when it's needed. Well,
this is that time! and it's needed now! :) Should write good
error messages from the start! :D

Bug: 235338094
Test: atest CtsNdkBinderTestCases
Change-Id: I85d0eba25a5cdb8341615d6fe3ac9c7e38fc28ca