spi: atmel-quadspi: Fix AHB memory accesses

spi: atmel-quadspi: Fix AHB memory accesses

Following error was seen when mounting a 16MByte ubifs:
UBIFS error (ubi0:0 pid 1893): check_lpt_type.constprop.6: invalid type (15) in LPT node type

QSPI_IFR.TFRTYP was not set correctly. When data transfer is enabled
and one wants to access the serial memory through AHB in order to:
 - read in the serial memory, but not a memory data, for example
   a JEDEC-ID, QSPI_IFR.TFRTYP must be written to '0' (both sama5d2
   and sam9x60).
 - read in the serial memory, and particularly a memory data,
   TFRTYP must be written to '1' (both sama5d2 and sam9x60).
 - write in the serial memory, but not a memory data, for example
   writing the configuration or the QSPI_SR, TFRTYP must be written
   to '2' for sama5d2 and to '0' for sam9x60.
 - write in the serial memory in particular to program a memory data,
   TFRTYP must be written to '3' for sama5d2 and to '1' for sam9x60.

Fix the setting of the QSPI_IFR.TFRTYP field.

Fixes: 2d30ac5ed633 ("mtd: spi-nor: atmel-quadspi: Use spi-mem interface for atmel-quadspi driver")
Cc: <stable@vger.kernel.org> # v5.0+
Reported-by: Tom Burkart <tom@aussec.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20201207135959.154124-2-tudor.ambarus@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>