clk: qcom: Add active only xo parent source for XO clocks

The XO clock sources from camcc/videocc/dispcc requires to vote for active
only clock source, so as to not block XO. While at it also remove VDD
voting for xo clock source.

Change-Id: I6966da45f794acc82e7163f7ffabf3f67c666940
Signed-off-by: Taniya Das <tdas@codeaurora.org>