Blackfin arch: split board selection off into mach subdirs

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/arch/blackfin/mach-bf537/boards/Makefile b/arch/blackfin/mach-bf537/boards/Makefile
index 23323ca..a5af7b5 100644
--- a/arch/blackfin/mach-bf537/boards/Makefile
+++ b/arch/blackfin/mach-bf537/boards/Makefile
@@ -2,8 +2,8 @@
 # arch/blackfin/mach-bf537/boards/Makefile
 #
 
-obj-y					+= eth_mac.o
-obj-$(CONFIG_GENERIC_BOARD)		+= generic_board.o
-obj-$(CONFIG_BFIN537_STAMP)		+= stamp.o led.o
-obj-$(CONFIG_BFIN537_BLUETECHNIX_CM)	+= cm_bf537.o
-obj-$(CONFIG_PNAV10)			+= pnav10.o
+obj-y                                  += eth_mac.o
+obj-$(CONFIG_GENERIC_BF537_BOARD)      += generic_board.o
+obj-$(CONFIG_BFIN537_STAMP)            += stamp.o led.o
+obj-$(CONFIG_BFIN537_BLUETECHNIX_CM)   += cm_bf537.o
+obj-$(CONFIG_PNAV10)                   += pnav10.o