[HWC3] VTS client updates for onRefreshRateChangedDebug callback
And for setRefreshRateChangedCallbackDebugEnabled

This does not add any implementation for the VTS code.
Implementation will be added with the VTS tests as a followup.

Test: Device boots
BUG: 202734676
Change-Id: If47bbcf87698b346907b3bc1903908ff0a63203f
4 files changed