dt-bindings: spi: zynqmp-qspi: Include two 'reg' properties only for the Zynq UltraSc...

dt-bindings: spi: zynqmp-qspi: Include two 'reg' properties only for the Zynq UltraScale QSPI

Linear mode is only supported by the Zynq UltraScale QSPI controller,
so update the bindings to include two 'reg' properties only for the
Zynq UltraScale QSPI controller.

Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@amd.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://patch.msgid.link/20240925114203.2234735-1-amit.kumar-mahapatra@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>