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/configs/cm_fx6_defconfig b/configs/cm_fx6_defconfig
index 2e178f1..33b5316 100644
--- a/configs/cm_fx6_defconfig
+++ b/configs/cm_fx6_defconfig
@@ -35,6 +35,7 @@
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_BMP=y
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_EXT4=y