drm/gma500: Add crtc prefix to vblank functions

These functions operate on a crtc and should be prefixed properly.

Suggested-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220322131742.11566-7-patrik.r.jakobsson@gmail.com