SPI subsystem API & features updates

[galak]

This issue catches the major issues that need to be finished for

• update controller drivers to new API
• update sensor/client drivers to new API
• utilize device tree for all new client and sensor drivers

[tbursztyka]

For the 2 firsts point, see PR #5921 all is done there.

For the third, I have a PR in preparation already.

[carlescufi]

@tbursztyka Can we close this?

[tbursztyka]

yes!