spi: dt-bindings: Introduce qcom,spi-qpic-snand

spi: dt-bindings: Introduce qcom,spi-qpic-snand

Document the QPIC-SPI-NAND flash controller present in the IPQ SoCs.
It can work both in serial and parallel mode and supports typical
SPI-NAND page cache operations.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Md Sadre Alam <quic_mdalam@quicinc.com>
Link: https://patch.msgid.link/20250224111414.2809669-2-quic_mdalam@quicinc.com
Signed-off-by: Mark Brown <broonie@kernel.org>