iommu/amd: Fix typo in macro parameter name

IVRS_GET_SBDF_ID is only called with fn as the fourth parameter,
so this had no effect, but fixing the name will avoid bugs if that
ever changes.
Signed-off-by: Michael Forney <mforney@mforney.org>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/381fbc430c0ccdd78b3b696cfc0c32b233526ca5.1669159392.git.mforney@mforney.orgSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd/init.c

@@ -85,7 +85,7 @@
 
 #define LOOP_TIMEOUT	2000000
 
-#define IVRS_GET_SBDF_ID(seg, bus, dev, fd)	(((seg & 0xffff) << 16) | ((bus & 0xff) << 8) \
+#define IVRS_GET_SBDF_ID(seg, bus, dev, fn)	(((seg & 0xffff) << 16) | ((bus & 0xff) << 8) \
 						 | ((dev & 0x1f) << 3) | (fn & 0x7))
 
 /*