drm/amd/display/dc/basics/vector: Make local function 'dal_vector_presized_costruct' static

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

drivers/gpu/drm/amd/amdgpu/../display/dc/basics/vector.c:55:6: warning: no previous prototype for ‘dal_vector_presized_costruct’ [-Wmissing-prototypes]

Cc: Harry Wentland <[e-mail]>
Cc: Leo Li <[e-mail]>
Cc: Alex Deucher <[e-mail]>
Cc: "Christian König" <[e-mail]>
Cc: David Airlie <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/basics/vector.c

···
 	return true;
 }
 
-bool dal_vector_presized_costruct(
+static bool dal_vector_presized_costruct(
 	struct vector *vector,
 	struct dc_context *ctx,
 	uint32_t count,