spi: cadence: Add Marvell xSPI interrupt changes

It is possible that before enabling interrupt, interrupt bit will be
set. It might cause improper IRQ handler behaviour. To fix it, clear
interrupt bit before enabling interrupts. That behaviour is specific to
Marvell xSPI implementation.
In addition in Marvell xSPI interrupt must be cleared in two places -
xSPI itself, and Marvell overlay.

Signed-off-by: Witold Sadowski <wsadowski@marvell.com>
Link: https://patch.msgid.link/20240724154739.582367-6-wsadowski@marvell.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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