lpm-levels: Do not consider cluster residency in suspend

If cluster deepest low power mode is disabled in idle path, the
residencies are recalculated and the max_residency for the shallower
mode becomes ~0 even if deepest mode is not disabled in suspend path.
Because of this while the cluster mode is selected during suspend,
it selects shallower mode instead of deepest mode available.

During suspend ignore the residency to select the cluster level
low power mode.

Change-Id: I812e33ad45e563b88c478d5d70296d5bd488438f
Signed-off-by: Srinivas Rao L <lsrao@codeaurora.org>