Use the expected frame duration from SF instead of HWUI.

We often don't get the HWUI callback and want to remove needing the HWUI
callback in the future.

This reverts commit 494e9f8a.
Now, with a fixed read only flag.

Bug: b/354763298
Test: FrameworksCoreTests manual
Flag: com.android.internal.jank.use_sf_frame_duration
Change-Id: I2e4d407d8046611807a0d6883ac77fed50042afa