kconfig: move CONFIG_CMD_BOOTM to Kconfig

CONFIG_CMD_BOOTM is defined in config_cmd_defaults.h
which is forcebly included from each board.
So, the default value of "config CMD_BOOTM" should be "y".

For some boards undefining it (bf506f-ezkit, controlcenterd_TRAILBLA,
controlcenterd_TRAILBLAZER_DEVELOP, controlcenterd_TRAILBLAZER),
"# CONFIG_CMD_BOOTM is not set" should be added to their defconfig.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/common/Kconfig b/common/Kconfig
index 5ae7190..5dc8ebf 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -1,4 +1,10 @@
 menu "Command line interface"
 	depends on !SPL_BUILD
 
+config CMD_BOOTM
+	bool "Enable bootm command"
+	default y
+	help
+	  Boot an application image from the memory.
+
 endmenu