ARM: mvebu: add revision id for Armada-385 B0

Marvell have release a B0 revision of the Armada-385 SoC. This fixes a
hardware errata enabling RGMII to work when the Ethernet voltage is
configured to 3.3V.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/mach-mvebu/cpu.c b/arch/arm/mach-mvebu/cpu.c
index 0d2d398..aa1be8e 100644
--- a/arch/arm/mach-mvebu/cpu.c
+++ b/arch/arm/mach-mvebu/cpu.c
@@ -261,6 +261,9 @@
 		case MV_88F68XX_A0_ID:
 			puts("A0");
 			break;
+		case MV_88F68XX_B0_ID:
+			puts("B0");
+			break;
 		default:
 			printf("?? (%x)", revid);
 			break;