Add optional properties for QSPI:
big-endian
if the register is big endian on this platform.
Signed-off-by: NYuan Yao <yao.yuan@nxp.com>
Acked-by: NRob Herring <robh@kernel.org>
Acked-by: NHan xu <han.xu@nxp.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>