spi: spi-mem: check if data buffers are on stack

spi: spi-mem: check if data buffers are on stack

The buffers passed in the data phase must be DMA-able. Programmers often
don't realise this requirement and pass in buffers that reside on the
stack. This can be hard to spot when reviewing code. Reject ops if their
data buffer is on the stack to avoid this.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Link: https://lore.kernel.org/r/20220420102022.3310970-1-p.yadav@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>