MLK-11932 video: fbdev: mxc: ldb: Do not touch fbi->modelist in ldb_init()

MLK-11932 video: fbdev: mxc: ldb: Do not touch fbi->modelist in ldb_init()

We don't have to touch fbi->modelist in ldb_init(), because mxcfb_register()
may initialize the list and add a video mode to the list for us.

This patch fixes the following issue reported by Coverity:
	INIT_LIST_HEAD(&fbi->modelist);
Uninitialized scalar variable (UNINIT)
uninit_use_in_call: Using uninitialized value fb_vm. Field fb_vm.name is
uninitialized when calling fb_add_videomode.
	fb_add_videomode(&fb_vm, &fbi->modelist);
	fb_videomode_to_var(&fbi->var, &fb_vm);

Signed-off-by: Liu Ying <Ying.Liu@freescale.com>