mtd: spi-nor: fsl-quadspi: add support for layerscape

LS1043a and LS2080A in the Layerscape family also support Freescale Quad
SPI, make Quad SPI selectable for these hardwares.

Signed-off-by: Yuan Yao <yao.yuan@nxp.com>
Acked-by: Han xu <han.xu@nxp.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>