EDAC: i7300_edac: fix a kernel-doc syntax

The declaration of the kerneldoc entry is wrong, causing this
warning:

	drivers/edac/i7300_edac.c:824: warning: Function parameter or member 'mir_no' not described in 'decode_mir'

Acked-by: Borislav Petkov <bp@alien8.de>
Acked-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>