clk: qcom: gcc-sm6375: Remove unused variables

gcc_parent_data_15 and gcc_parent_map_15 are not used in this driver.
Remove them.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20221003211438.25691-1-konrad.dybcio@somainline.org


Fixes: 184fdd87 ("clk: qcom: Add global clock controller driver for SM6375")
Signed-off-by: Stephen Boyd <sboyd@kernel.org>