clk: eyeq: require clock index with phandle in all cases

We used to let compatibles with a single clock exposed to not have
a cell. Switch away from that and enforce a cell in all cases.

This is done at the same time as some compatibles
(mobileye,eyeq6h-{central,west}-olb) go from one to more clocks
exposed. Let's do the same switch and avoid future devicetree
work if/when others follow.

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Link: https://lore.kernel.org/r/20241106-mbly-clk-v2-4-84cfefb3f485@bootlin.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>