doc: lpspi: Document DT bindings for LPSPI slave mode

Add introductions of interrupt-parent and spi-slave.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Clark Wang 2018-12-07 02:50:41 +00:00 • committed by Mark Brown
commit 62f82df488
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