clk: qcom: clock-8994: Move gcc_mss_cfg_ahb_clk to RPM

gcc_mss_cfg_ahb_clk is now controlled by RPM. Remove it from
clock-gcc-8994 and add mss_cfg_ahb_clk in clock-rpm-8994.

Change-Id: I03293fe4f9bf1d97e38999d38229c838e869fb7c
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>