clk: mediatek: mt7986: drop 1/1 spurious factor for topckgen

clk: mediatek: mt7986: drop 1/1 spurious factor for topckgen

Now that we can have advanced parent handling for mux, we can drop
spurious topckgen 1/1 factor. This is in preparation to make the clk
ID match the ID in upstream include for mt7986.

Drop the factor entry from mt7986-clk.h and reference to them in
mt7981.dtsi. Muxes and gates are updated to reference the apmixed clk
following how it's done in upstream kernel linux. Add relevant clk type
flag in clk_tree for apmixed.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>