Remove per-display caching toggle

* No one uses it, and just globally toggles caching
* The global toggle broke :(

So fix this by just removing the per-display caching toggle.

Bug: 405288154
Flag: EXEMPT bug fix
Test: adb shell service SurfaceFlinger call 1040 i32 0
Change-Id: Id8e28e3a57db51599b190e1978db0b89607aa612