spi: Transform the FSL QuadSPI driver to use the SPI MEM API

To support the SPI MEM API, instead of modifying the existing U-Boot
driver, this patch adds a port of the existing Linux driver.
This also has the advantage that porting changes and fixes from Linux will
be easier.
Porting of driver left most of the functions unchanged while few of the
changes are:
-Remove lock(mutexes) and irq handler as u-boot is a single core execution.
-Remove invalid masterid as it was required specially for multicore
execution in LS2088ARDB which is not the case in u-boot.
-Remove clock support as changing spi speed is not supported in uboot and
nor in linux.

Currently tested on LS1088ARDB, LS1012ARDB, LS1046ARDB, LS1046AFRWY,
LS1043AQDS, LS1021ATWR, LS2088ARDB, I.MX6ULL EVK.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Ashish Kumar <Ashish.Kumar@nxp.com>
Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>
Acked-by: Vignesh Raghavendra <vigneshr@ti.com>
Acked-by: Jagan Teki <jagan@amarulasolutions.com>