clk: amlogic: use the common pclk definition

Replace marcros defining pclks with the common one, reducing code
duplication.

Link: https://lore.kernel.org/r/20250825-meson-clk-cleanup-24-v2-9-0f402f01e117@baylibre.com


Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>