drivers: spi: add DEINIT_ variants of SPI_DEVICE_ macros Add DEVICE_DEINIT variants of SPI_DEVICE_ macros. These include - SPI_DEVICE_DT_DEINIT_DEFINE() - SPI_DEVICE_DT_INST_DEINIT_DEFINE() Signed-off-by: Bjarki Arge Andreasen <bjarki.andreasen@nordicsemi.no>