[Blackfin] arch: Initial checkin of the memory protection support.

Enable it with CONFIG_MPU.

Signed-off-by: Bernd Schmidt <bernd.schmidt@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/arch/blackfin/Makefile b/arch/blackfin/Makefile
index 2fc899c..0edc402 100644
--- a/arch/blackfin/Makefile
+++ b/arch/blackfin/Makefile
@@ -82,7 +82,11 @@
 core-y   += arch/$(ARCH)/mach-$(MACHINE)/boards/
 endif
 
-core-y	 += arch/$(ARCH)/kernel/cplb-nompu/
+ifeq ($(CONFIG_MPU),y)
+core-y	+= arch/$(ARCH)/kernel/cplb-mpu/
+else
+core-y	+= arch/$(ARCH)/kernel/cplb-nompu/
+endif
 
 libs-y   += arch/$(ARCH)/lib/