clk: qcom: gcc-msm8994: Modernize the driver

Switch to the newer-style parent_data and remove the hardcoded
xo clock.
Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20210923162645.23257-2-konrad.dybcio@somainline.orgSigned-off-by: Stephen Boyd <sboyd@kernel.org>