drm/meson/meson_venc: Make local function 'meson_venc_hdmi_get_dmt_vmode' static

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/meson/meson_venc.c:893:6: warning: no previous prototype for ‘meson_venc_hdmi_get_dmt_vmode’ [-Wmissing-prototypes]

Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-amlogic@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20201116174112.1833368-14-lee.jones@linaro.org

drivers/gpu/drm/meson/meson_venc.c

@@ -890,7 +890,7 @@ bool meson_venc_hdmi_supported_vic(int vic)
 }
 EXPORT_SYMBOL_GPL(meson_venc_hdmi_supported_vic);
 
-void meson_venc_hdmi_get_dmt_vmode(const struct drm_display_mode *mode,
+static void meson_venc_hdmi_get_dmt_vmode(const struct drm_display_mode *mode,
 					  union meson_hdmi_venc_mode *dmt_mode)
 {
 	memset(dmt_mode, 0, sizeof(*dmt_mode));