[PATCH v1] spi: designware: add support for bits-per-word DT binding

[Ng, Boon Khai]

> will implement something like that in U-Boot too as follow:
> 1) Add the bits_per_word in the spi_slave struct
> 2) at the dw_spi_xfer function to resolve for the slave->bits_per_word 
> value and store into the priv->bits_per_word, default to 8 otherwise
> 

Submitted the change at:
https://patchwork.ozlabs.org/project/uboot/patch/20260312044633.29242-1-boon.khai.ng@altera.com/

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