Change expected return type in direct report VTS

If a sensor doesn't support a particular memory type for direct
reporting, then registerChannel will return an invalid channel handle.
When this handle is used in configureDirectReport, it will return
BAD_VALUE and when used in unregisterDirectReport, it will return OK.
Currently, the VTS tests assert it will return INVALID_OPERATION, but
that will only happen if the entire HAL doesn't support direct
reporting instead of a single sensor not supporting a certain memory
type.

Bug: 138758242
Test: Run VTS and verify DirectChannel* tests now pass
Change-Id: Ifba4262b68ec0c4ca6921dad40a03e0a52088d28