amd64_edac: Adjust ECC symbol size to F15h

F15h has the same ECC symbol size options as F10h revD and later so
adjust checks to that. Simplify code a bit.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
index 3f853ed..4de31c8 100644
--- a/drivers/edac/amd64_edac.h
+++ b/drivers/edac/amd64_edac.h
@@ -363,7 +363,7 @@
 	u32 online_spare;	/* On-Line spare Reg */
 
 	/* x4 or x8 syndromes in use */
-	u8 syn_type;
+	u8 ecc_sym_sz;
 
 	/* place to store error injection parameters prior to issue */
 	struct error_injection injection;