soc/amd/stoneyridge: use index for mca_bank_name initialization

Change-Id: Id640fd8006c47ce1db8a8729407c1c9a9c1e79c3
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56272
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/stoneyridge/mca.c

@@ -136,13 +136,13 @@ failed:
 }
 
 static const char *const mca_bank_name[] = {
-	"Load-store unit",
-	"Instruction fetch unit",
-	"Combined unit",
-	"Reserved",
-	"Northbridge",
-	"Execution unit",
-	"Floating point unit"
+	[0] = "Load-store unit",
+	[1] = "Instruction fetch unit",
+	[2] = "Combined unit",
+	[3] = "Reserved",
+	[4] = "Northbridge",
+	[5] = "Execution unit",
+	[6] = "Floating point unit"
 };
 
 static void mca_print_error(unsigned int bank)