clk: qcom: Clean up the MSM8996 multimedia clock controller (MMCC) driver

Following list of changes have been made
1. Add the missing clocks in multimedia clock controller driver.
   Also clean up clock flags and parent info for few clocks.
2. Removing clocks which are not controlled by HLOS.
3. MMCC needs to vote for volatge level on rail for the clock
   frequencies, so add voltage voting in MMCC.
4. Initial rate configuration for MMPLLs.

Change-Id: If3d84e52783651b611b624dbc60b18993c0f0b1a
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>
Signed-off-by: Amit Nischal <anischal@codeaurora.org>