Add a driver for Microchip FPGA QSPI controllers. This driver also
supports "hard" QSPI controllers on Polarfire SoC.
Signed-off-by: NNaga Sureshkumar Relli <nagasuresh.relli@microchip.com>
Reviewed-by: NConor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20220808064603.1174906-4-nagasuresh.relli@microchip.comSigned-off-by: NMark Brown <broonie@kernel.org>