Send clock rate as 0 for src clocks to MMRM, when disabling
the clock. This will help MMRM in peak overshoot computation.
CRs-Fixed: 2841729
Change-Id: I048b530fb620f0e47e1596f31e2ca12ff43bb471
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>