spi: Tesla FSD support

Merge series from Alim Akhtar:

This series adds support for the SPI controller in the Tesla FSD SoC,
also pulling in:

   git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git ib-mfd-spi-dt-v5.18

from the MFD tree which has dependencies for the DT bindings.

diff --cc Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
Simple merge

diff --cc MAINTAINERS
Simple merge

diff --cc drivers/spi/spi-s3c64xx.c
Simple merge