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We used to assume 16bits is sufficient, but somehow it's not always the
case. In this cl, let handshake message and pcm audio message no longer
share the same packet header. I.e., let them have their own header
struct and read/make methods.

Besides, add more unittest to cover packet header poluate/parse.

Merge-With: eureka-internal/453374
Bug: internal: 168457620
Test: Unittest.
Change-Id: I6e10fe9d58974646029ba222229e2f6d4df8acd5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2413110
Commit-Queue: Kehuang Li <kehuangli@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809715}