Fix BufferHubBuffer black screen

1/ BufferHubService should read back fields of
HardwareBufferDescription of allocated BufferNode and send them back
to the client.
2/ Update some minor naming for better readability.

Bug: 122959735
Test: cts-tradefed run commandAndExit cts -m CtsNativeHardwareTestCases
Change-Id: I10a176810d78c754fe0b69d4128078fc17d50035
2 files changed