clk: qcom: smd-rpm: add XO_BUFFER clock for each XO_BUFFER_PINCTRL clock

For each XO_BUFFER_PINCTRL there is a corresponding XO_BUFFER clock.
Add them automatically to drop the duplication between the clock
definitions.

Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221209164855.128798-10-dmitry.baryshkov@linaro.org