x86/mce: Fix debugfs_simple_attr.cocci warnings

Use DEFINE_DEBUGFS_ATTRIBUTE() rather than DEFINE_SIMPLE_ATTRIBUTE()
for debugfs files.

Semantic patch information:

  Rationale: DEFINE_SIMPLE_ATTRIBUTE + debugfs_create_file()
  imposes some significant overhead as compared to
  DEFINE_DEBUGFS_ATTRIBUTE + debugfs_create_file_unsafe().

Generated by: scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Yazen Ghannam <yazen.ghannam@amd.com>
Cc: kernel-janitors@vger.kernel.org
Link: http://lkml.kernel.org/r/1545981853-70877-1-git-send-email-yuehaibing@huawei.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>