spi: fix kabi breakage in struct spi_controller

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9RBZI


CVE: CVE-2021-47469

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Move struct mutex add_lock from struct spi_controller to struct
device in case of kabi breakage in struct spi_controller.

Fixes: 6098475d ("spi: Fix deadlock when adding SPI controllers on SPI buses")
Signed-off-by: Zeng Heng <zengheng4@huawei.com>