video: ARM CLCD: export symbols for driver module

The amba-clcd-versatile.c code is always built-in and has to
be done that way because it gets called by platform code that is
also built-in. However, it now also gets called from the
core CLCD driver through the .init_panel callback function,
which leads to a build error when the framebuffer is configured
as a loadable module:

ERROR: "versatile_clcd_init_panel" [drivers/video/fbdev/amba-clcd-mod.ko] undefined!

The same thing happens for the nomadik driver, although that
could be linked into the core module if we want to:

ERROR: "nomadik_clcd_init_panel" [drivers/video/fbdev/amba-clcd.ko] undefined!
ERROR: "nomadik_clcd_init_board" [drivers/video/fbdev/amba-clcd.ko] undefined!

For consistency, I'm taking the same approach in both cases here
and just export the functions to make them usable by the driver.

Alternatively, we could split out the CONFIG_OF-code from amba-clcd-versatile.c
into a new file and link those two together with the core driver as one
module.

Signed-off-by: Arnd Bergmann <[e-mail]>
Fixes: 1d3f0cbe0d3a ("video: ARM CLCD: add special board and panel hooks for Nomadik")
Fixes: 25348160e9a4 ("video: ARM CLCD: add special panel hook for Versatiles")
Reviewed-by: Linus Walleij <[e-mail]>
Signed-off-by: Tomi Valkeinen <[e-mail]>

drivers/video/fbdev/amba-clcd-nomadik.c

···
 	/* Unknown panel, fall through */
 	return 0;
 }
+EXPORT_SYMBOL_GPL(nomadik_clcd_init_panel);
 
 #define PMU_CTRL_OFFSET 0x0000
 #define PMU_CTRL_LCDNDIF BIT(26)
···
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(nomadik_clcd_init_board);

drivers/video/fbdev/amba-clcd-versatile.c

···
 
 	return 0;
 }
-
+EXPORT_SYMBOL_GPL(versatile_clcd_init_panel);
 #endif