drm/amd/display/dc/dce60/dce60_timing_generator: Make 'dce60_configure_crc'...

drm/amd/display/dc/dce60/dce60_timing_generator: Make 'dce60_configure_crc' invoked by reference static

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

 drivers/gpu/drm/amd/amdgpu/../display/dc/dce60/dce60_timing_generator.c:192:6: warning: no previous prototype for ‘dce60_configure_crc’ [-Wmissing-prototypes]

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Mauro Rossi <issor.oruam@gmail.com>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce60/dce60_timing_generator.c

@@ -189,8 +189,8 @@ static bool dce60_is_tg_enabled(struct timing_generator *tg)
 	return field == 1;
 }
 
-bool dce60_configure_crc(struct timing_generator *tg,
-			  const struct crc_params *params)
+static bool dce60_configure_crc(struct timing_generator *tg,
+				const struct crc_params *params)
 {
 	/* Cannot configure crc on a CRTC that is disabled */
 	if (!dce60_is_tg_enabled(tg))