powerpc/BSR: add 4096 byte BSR size

Add a 4096 byte BSR size which will be used on new machines.  Also, remove
the warning when we run into an unknown size, as this can spam the kernel
log excessively.
Signed-off-by: Sonny Rao <sonnyrao@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

drivers/char/bsr.c

@@ -79,8 +79,9 @@ enum {
 	BSR_16   = 1,
 	BSR_64   = 2,
 	BSR_128  = 3,
-	BSR_UNKNOWN = 4,
-	BSR_MAX = 5,
+	BSR_4096 = 4,
+	BSR_UNKNOWN = 5,
+	BSR_MAX  = 6,
 };
 
 static unsigned bsr_types[BSR_MAX];
@@ -218,9 +219,11 @@ static int bsr_add_node(struct device_node *bn)
 		case 128:
 			cur->bsr_type = BSR_128;
 			break;
+		case 4096:
+			cur->bsr_type = BSR_4096;
+			break;
 		default:
 			cur->bsr_type = BSR_UNKNOWN;
-			printk(KERN_INFO "unknown BSR size %d\n",cur->bsr_bytes);
 		}
 
 		cur->bsr_num = bsr_types[cur->bsr_type];