use vector<uint8_t> for byte[] in AIDL

In native world, byte stream is typically represented in uint8_t[]
or vector<uint8_t>. C++ backend already generates that way. This
change involves NDK backend.

Now NDK backend also uses vector<uint8_t> just like C++ backend.

Bug: 144957764
Test: atest CtsNdkBinderTestCases
Merged-In: I74bf803a3781c83c4102972f5df67312131bb879
Change-Id: I74bf803a3781c83c4102972f5df67312131bb879
(cherry picked from commit d9a228a9)

Exempt-From-Owner-Approval: cp from master to avoid merge-conflict