[SF] Use render rate for the compositorTiming

Vsync Period does not represent the actual
composition rate in the framework anymore,
render rate is the more accurate composition rate.

BUG: 383938139
BUG: 355342197
Flag: EXEMPT bug fix
Test: atest CtsDeqpTestCases --test-filter '*dEQP-EGL.functional.get_frame_timestamps*'
Test: Before fix http://ab/I51300010353712246
Test: After the fix http://ab/I22500010354940353
Change-Id: I33574b3ff347264a19e2e0bcfd2236639aad01a5