Blackfin arch: add support for BF52x-0.2, BF533-0.6, and BF54x-0.2

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

diff --git a/arch/blackfin/Makefile b/arch/blackfin/Makefile
index eac0533..6bf5097 100644
--- a/arch/blackfin/Makefile
+++ b/arch/blackfin/Makefile
@@ -67,6 +67,7 @@
 rev-$(CONFIG_BF_REV_0_3)  := 0.3
 rev-$(CONFIG_BF_REV_0_4)  := 0.4
 rev-$(CONFIG_BF_REV_0_5)  := 0.5
+rev-$(CONFIG_BF_REV_0_6)  := 0.6
 rev-$(CONFIG_BF_REV_NONE) := none
 rev-$(CONFIG_BF_REV_ANY)  := any