spi: zynqmp-gqspi: Always acknowledge interrupts

spi: zynqmp-gqspi: Always acknowledge interrupts

[ Upstream commit 89785306453ce6d949e783f6936821a0b7649ee2 ]

RXEMPTY can cause an IRQ, even though we may not do anything about it
(such as if we are waiting for more received data). We must still handle
these IRQs because we can tell they were caused by the device.

Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
Link: https://patch.msgid.link/20250116224130.2684544-6-sean.anderson@linux.dev
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>