fbdev/sh_mobile: remove sh_mobile_lcdc_display_notify

It's dead code, and removing it avoids me having to understand
what it's doing with lock_fb_info.

v2: Also remove sh_mobile_lcdc_must_reconfigure, now unused (Sam).

Signed-off-by: Daniel Vetter <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]> (v1)
Reviewed-by: Sam Ravnborg <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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