drm/amd/display/dc/core/dc_resource: Staticify local functions

drm/amd/display/dc/core/dc_resource: Staticify local functions

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

 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1120:5: warning: no previous prototype for ‘shift_border_left_to_dst’ [-Wmissing-prototypes]
 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1131:6: warning: no previous prototype for ‘restore_border_left_from_dst’ [-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: 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>