cpuidle: lpm-workarounds: Skip L2 spm programming in HLOS

There is a race programming L2 SPM in HLOS and enabling/disabling
L2 SPM as a workaround for SDI fix in TZ is causing wierd crashes
in TZ and HLOS. This change is to avoid that race by allowing only
TZ to program SPM based on the flag passed from HLOS to avoid that
race condition.

Change-Id: I426289e1fc66664ed9c4ecf81c4106ce2c7c1145
Signed-off-by: Anil Kumar Mamidala <amami@codeaurora.org>