The current driver uses a mix of radix tree and a fwd lookup
table to translate between apid and ppid. It is buggy and confusing.

Instead simply use a radix tree for v1 hardware and use the
forward lookup table for v2.
Signed-off-by: NAbhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: NKiran Gunda <kgunda@codeaurora.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>