clk: qcom: Park cam_cc_slow_ahb_clk_src to XO during disable

As per HPG, cam_cc_slow_ahb_clk_src is required to park at XO
during clock disable in order to gracefully power down the
camera memories. Add support for the same by 'enable_safe_config'
flag. Also change the halt check type for cam_cc_core_ahb_clk.

Change-Id: Ie9fbb3be6b55663ac03a43f4269f50d10f9bbc55
Signed-off-by: Amit Nischal <anischal@codeaurora.org>