clk: qcom: camcc: Update the PLL control register for LITO

The user control registers are updated as per recommendation. While at it
update the critical xo clocks parents to active only source to avoid
XO shutdown.

Change-Id: I01783f7db1950aec533e10793d0a6f871ef970ad
Signed-off-by: Taniya Das <tdas@codeaurora.org>