cameraserver: Wrap calls to IPCThreadState functions to factor in different transports.

Add a wrapper around calls to IPCThreadState to
account for the fact that remote HIDL calls may use binder function
implementations internally.Therefore, we need to know whether we are on
a binder / hwbinder thread and call the appropriate IPCThreadState /
hardware::IPCThreadState function internally.

Bug: 110364143

Test: GCA
Test: Third party app
Test: camera CTS (no new failures).

Change-Id: Ibad03fafd2ccc53a5352a6df45cf8f641bc7a3bf
Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>