clk: ti: clk-k3: Notify AVS driver upon setting clock rate

AVS is enabled at R5 SPL stage, on few platforms like J721E
and J7200 clk-k3 is used instead if clk-sci driver.

Add support in clk-k3 driver as well to notify AVS driver
on setting clock rate so that voltage is changed accordingly.

Cc: Keerthy <j-keerthy@ti.com>
Signed-off-by: Udit Kumar <u-kumar1@ti.com>