Remove isCameraRotationEnabled from RotationPolicyWrapper

The reason for this change is to enable the reuse of RotationPolicyWrapper in Launcher for better unit testability.
The original implementation was difficult to use in Launcher because it required SystemUI-specific dependencies.

To simplify sharing the RotationPolicyWrapper, we are decoupling it from SecureSettings.
This also aligns with the principle that the method isCameraRotationEnabled should not be part of the RotationPolicyWrapper in the first place, as it's not a part of the RotationPolicy class itself.

Test: Refactor only, No behaviour change
Flag: EXEMPTY REFACTOR
Bug: 430756509
Change-Id: Ia9a9aaf94b4c52f3151d0908d043a67cda640aa0