spi: atmel-quadspi: Fix QSPI_RD reg name on verbose debug

It was wrongly set to "MR", fix it.

Fixes: 52e2565bfb ("spi: atmel-quadspi: Add verbose debug facilities to monitor register accesses")
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
1 file changed