clk: qcom: clock-gcc-8952: Vote for CX when gpll3 & 4 in use

To run at gpll3 and gpll4 at vco mode 0, Cx must be at NOM
voltage. Vote for cx NOM when plls are in use.

Change-Id: Ia6614c48a1cc46e7d7630ded5b1d5f27755c83ec
Signed-off-by: Arun KS <arunks@codeaurora.org>