arm: omap: combine zoom2 and zoom3 board-files

They are extremely similar anyway, let's get rid
of one file.

While at that, also remove the empty zoom_config
variable.

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 60e51bc..b0810b9 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -144,12 +144,12 @@
 					   board-rx51-peripherals.o \
 					   board-rx51-video.o \
 					   hsmmc.o
-obj-$(CONFIG_MACH_OMAP_ZOOM2)		+= board-zoom2.o \
+obj-$(CONFIG_MACH_OMAP_ZOOM2)		+= board-zoom.o \
 					   board-zoom-peripherals.o \
 					   board-flash.o \
 					   hsmmc.o \
 					   board-zoom-debugboard.o
-obj-$(CONFIG_MACH_OMAP_ZOOM3)		+= board-zoom3.o \
+obj-$(CONFIG_MACH_OMAP_ZOOM3)		+= board-zoom.o \
 					   board-zoom-peripherals.o \
 					   board-flash.o \
 					   hsmmc.o \