* bsp: nxp/mcx/mcxn: SPI: Added missing bracket and re-format code.
The closing bracket is missing from SPI6 struct.
Introduced since commit fc1cfd6d3627ba8460d514e7913bd307e8b1d567 .
Use standard rt_spi_device->cs_pin instead of user_data pointer.
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Signed-off-by: Yilin Sun <imi415@imi.moe>
* [bsp][nxp] add missing drv_spi.h
Otherwise when building spi users such as u8g2, gcc will complain can't
find the drv_spi.h.
* [bsp][nxp] enable spi6
* [bsp][nxp] add spi sample code which uses spi6 to loopback
Connect spi6's MISO <--> MSIO, I.E P3_20 and P3_22 with Dupont Line
The sample usage and output would be:
msh >spi_sample
spi rbuf : 0 1 2 3 4 5 6 7 8 9 a b c d e f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
spi loopback mode test over!