This prepares for the Clip which will define HAVE_LCD_ENABLE but won't
need the hook since the internal LCD framebuffer is updated regardless
if the display is on or off.
firmware/drivers/lcd-16bit.c has not been modified since HAVE_LCD_COLOR
is obviously defined here
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18951 a1c6a512-1295-4272-9138-f99709370657