spi: mpfs: fix controller deregistration

spi: mpfs: fix controller deregistration

Make sure to deregister the controller before disabling underlying
resources like interrupts during driver unbind.

Fixes: 9ac8d17694b6 ("spi: add support for microchip fpga spi controllers")
Cc: stable@vger.kernel.org	# 6.0
Cc: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260409120419.388546-21-johan@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>