spi: microchip-core: fix UAF in mchp_corespi_remove()

spi: microchip-core: fix UAF in mchp_corespi_remove()

When using devm_spi_register_master(), the unregister function will
be called in devres_release_all() which is called after ->remove(),
so remove spi_unregister_master() andspi_master_put().

Fixes: 9ac8d17694b6 ("spi: add support for microchip fpga spi controllers")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20220713025657.3524506-2-yangyingliang@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>