spi: mxic: fix controller deregistration

spi: mxic: fix controller deregistration

Make sure to deregister the controller before disabling underlying
resources like clocks (via runtime pm) during driver unbind.

Fixes: b942d80b0a39 ("spi: Add MXIC controller driver")
Cc: stable@vger.kernel.org	# 5.0: cc53711b2191
Cc: stable@vger.kernel.org	# 5.0
Cc: Mason Yang <masonccyang@mxic.com.tw>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20260414134319.978196-6-johan@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>