dt-bindings: qspi: cdns,qspi-nor: Add clocks for StarFive JH7110 SoC

The QSPI controller needs three clock items to work properly on StarFive
JH7110 SoC, so there is need to change the maxItems's value to 3.

Signed-off-by: William Qiu <william.qiu@starfivetech.com>
Reviewed-by: Hal Feng <hal.feng@starfivetech.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230804020254.291239-2-william.qiu@starfivetech.com


Signed-off-by: Mark Brown <broonie@kernel.org>