clk: sunxi-ng: h3: Allow parent change for ve clock

Cedrus driver wants to set VE clock higher than it's possible without
changing parent rate.

In order to correct that, allow changing parent rate for VE clock.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>