msm: lpm-levels: use correct enums for level modes

struct lpm_cluster_level's mode is an array of enum representing
SPM low power modes. The current code compares the values in it
with enum msm_pm_sleep_mode which represents cpu sleep modes.

Fix this by comparing mode with SPM low power modes.

Change-Id: I49ae054298f4f8f71a4a4476c541db3ec69935d0
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>