EDAC, skx: Fix function calling order in skx_exit()

The order of function calling in skx_exit() is not the reversed order in
skx_init(). Fix it.

Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
CC: Mauro Carvalho Chehab <mchehab@kernel.org>
CC: Tony Luck <tony.luck@intel.com>
CC: arozansk@redhat.com
CC: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/1542353616-13421-1-git-send-email-qiuxu.zhuo@intel.com