spi: cadence-quadspi: Fix error message on stuck busy state

We are not iterating CQSPI_REG_RETRY, we are waiting 'timeout' ms, since
day 1.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>