clk: msm: clock-mmss-8998: Set non_local_children flag for mdp_clk_src

For some use cases, mdp clock source needs to be parked at a safe
frequency when it is disabled and force enabled in order to execute
a safe dynamic switch. Add support for the same by adding
non_local_children flag.

Change-Id: Idcbaef90fdfcb80e93b00c61a91e5eadaabfbf56
Signed-off-by: Amit Nischal <anischal@codeaurora.org>