[PATCH] i3c: don't fail if GETHDRCAP is unsupported

[Wolfram Sang]

Hi Joshua,

> I'm use `MMC5633` to test out the HDR-DDR functionality master functionality.
> The patch can be accepted as some controller might not support HDR.

May I read this as an Acked-by? Then, I would add it when sending v2.

Happy hacking,

   Wolfram