scsi: hisi_sas: Create trigger_dump at the end of the debugfs initialization

In the current debugfs initialization process, the interface
trigger_dump is created first, and then the dump directory is created to
store the register dump information.

The issue is that after the trigger_dump interface is created, users can
access the interface to trigger dump and call
debugfs_create_files_v3_hw().  In debugfs_create_files_v3_hw(), if
.debugfs_dump_dentry is NULL, the file for storing dump information is
created under /sys/kernel/debug, and the memory and information cannot
be released after the driver is uninstalled.

Therefore, the creation of the trigger_dump interface is placed at the
end of debugfs initialization.

Signed-off-by: Yihang Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Xiang Chen <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

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