clk: qcom: gcc-sc8280xp: drop obsolete PCIe GDSC comment

clk: qcom: gcc-sc8280xp: drop obsolete PCIe GDSC comment

Drop an obsolete comment about keeping the PCIe GDSCs always-on,
something which is no longer the case since commit db382dd55bcb ("clk:
qcom: gcc-sc8280xp: Allow PCIe GDSCs to enter retention state").

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250910134737.19381-1-johan+linaro@kernel.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>