clk: qcom: gcc-sdm845: Add GCC clock programming support for SDM845 v2.1

The gcc_aggre_noc_pcie_tbu_clk clock that needed to be kept
enabled always on previous versions of the target can now
be gated on SDM845 v2.1. Add support to allow toggling it.

Change-Id: I6ba66e09ec827f319e54a82e49ec21e9f1da6524
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>