SurfaceFlinger: allow confing change in AoD

Remove the restriction in setDesiredActiveConfig when we are in '
AoD mode as there are no limitations in setting the config during AoD.

Test: Set power mode to HWC_POWER_MODE_DOZE and change active configs
Bug: 128635447
Change-Id: Iff74d3deb2c4a72428f916d35676b0b60436e2de