drm/meson/meson_vclk: Make two local functions static

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

 drivers/gpu/drm/meson/meson_vclk.c:134:6: warning: no previous prototype for ‘meson_vid_pll_set’ [-Wmissing-prototypes]
 drivers/gpu/drm/meson/meson_vclk.c:490:6: warning: no previous prototype for ‘meson_hdmi_pll_set_params’ [-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/20201116174112.1833368-15-lee.jones@linaro.org

drivers/gpu/drm/meson/meson_vclk.c

@@ -131,7 +131,7 @@ enum {
 	VID_PLL_DIV_15,
 };
 
-void meson_vid_pll_set(struct meson_drm *priv, unsigned int div)
+static void meson_vid_pll_set(struct meson_drm *priv, unsigned int div)
 {
 	unsigned int shift_val = 0;
 	unsigned int shift_sel = 0;
@@ -487,7 +487,7 @@ static inline unsigned int pll_od_to_reg(unsigned int od)
 	return 0;
 }
 
-void meson_hdmi_pll_set_params(struct meson_drm *priv, unsigned int m,
+static void meson_hdmi_pll_set_params(struct meson_drm *priv, unsigned int m,
 				      unsigned int frac, unsigned int od1,
 				      unsigned int od2, unsigned int od3)
 {