Add SPI driver, block device layer, and SDHC-SPI SD card driver #66

Job	Run time
peripheral-drivers (src/block/sdhc_spi.c)	1m 0s
boards (pic32cz_curiosity_ultra, -DWHAL_CFG_NO_TIMEOUT)	39s
core-tests	7s
boards (stm32wb55xx_nucleo, -DWHAL_CFG_NO_TIMEOUT)	59s
boards (stm32wb55xx_nucleo)	57s
boards (pic32cz_curiosity_ultra)	40s
core-tests (-DWHAL_CFG_NO_TIMEOUT)	7s
	4m 29s

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