Convert CONFIG_CMD_BMP to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_BMP

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: Add depends on LCD || DM_VIDEO || VIDEO]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 306027c..6488701 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -642,6 +642,18 @@
 
 menu "Misc commands"
 
+config CMD_BMP
+	bool "Enable 'bmp' command"
+	depends on LCD || DM_VIDEO || VIDEO
+	help
+	  This provides a way to obtain information about a BMP-format iamge
+	  and to display it. BMP (which presumably stands for BitMaP) is a
+	  file format defined by Microsoft which supports images of various
+	  depths, formats and compression methods. Headers on the file
+	  determine the formats used. This command can be used by first loading
+	  the image into RAM, then using this command to look at it or display
+	  it.
+
 config CMD_BKOPS_ENABLE
 	bool "mmc bkops enable"
 	depends on CMD_MMC