Revert "[Backport] block: take bd_mutex around delete_partitions in del_gendisk"

hulk inclusion
category: bugfix
bugzilla: 55097 https://gitee.com/openeuler/kernel/issues/I4DDEL



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This reverts commit 5ff55bd87e0c5a1f7ca9c802b73368ea1cfa282f.

The patch set for partition symlink cleanup will introduce
deadlock for nbd, loop and xen-blkfront driver, so revert it.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>