omap4_common: Enable CONFIG_CMD_BOOTZ

With v3.9 and later of the Linux Kernel defaulting to multi-platform
images with omap2plus_defconfig, uImage isn't builtable anymore by
default.  Add CONFIG_CMD_BOOTZ so that we can still boot something the
kernel spits out.

Cc: Sricharan R <r.sricharan@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>
Reviewed-by: R Sricharan <r.sricharan@ti.com>

include/configs/omap4_common.h

@@ -52,7 +52,7 @@
 #define CONFIG_MISC_INIT_R
 
 #define CONFIG_OF_LIBFDT		1
-
+#define CONFIG_CMD_BOOTZ
 #define CONFIG_CMDLINE_TAG		1	/* enable passing of ATAGs */
 #define CONFIG_SETUP_MEMORY_TAGS	1
 #define CONFIG_INITRD_TAG		1