msm: thermal: Check clients request just after frequency thread init

KTM frequency mitigation thread initializes during late init call.
Prior to this, client can request frequency mitigation. But request
will not be processed, since frequency mitigation thread won't be
initialized. Notify frequency mitigation thread to aggregate clients
current request immediately after thread initialization.

Change-Id: Id2425041b14554d58f944794e1b5db273f5ded26
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>