clk: qcom: debugcc-sdm845: Changes to the debug mux structure

The spdm clocks are currently not supported. Remove their
entries from the debug mux structure and add an entry for
gpu_cc_gx_gfx3d_clk.

Change-Id: Id1c80bc16f32d9e2b5b8930bdd8d6361159b6339
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>