spi: spi-bcm-qspi: replace 'delay_usecs' with 'delay.value' check

The 'delay_usecs' field is going away. The replacement for it is the
'delay' field. So, we should check for 'delay.value' being non-zero.

Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
Link: https://lore.kernel.org/r/20210308145502.1075689-4-aardelean@deviqon.com


Signed-off-by: Mark Brown <broonie@kernel.org>