drm/amd/display/dc/dce120/dce120_resource: Staticify local functions

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

 drivers/gpu/drm/amd/amdgpu/../display/dc/dce120/dce120_resource.c:426:32: warning: no previous prototype for ‘dce120_opp_create’ [-Wmissing-prototypes]
 drivers/gpu/drm/amd/amdgpu/../display/dc/dce120/dce120_resource.c:440:17: warning: no previous prototype for ‘dce120_aux_engine_create’ [-Wmissing-prototypes]
 drivers/gpu/drm/amd/amdgpu/../display/dc/dce120/dce120_resource.c:478:20: warning: no previous prototype for ‘dce120_i2c_hw_create’ [-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: Anthony Koo <Anthony.Koo@amd.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/dce120/dce120_resource.c

@@ -423,7 +423,7 @@ static const struct dce110_clk_src_mask cs_mask = {
 		CS_COMMON_MASK_SH_LIST_DCE_112(_MASK)
 };
 
-struct output_pixel_processor *dce120_opp_create(
+static struct output_pixel_processor *dce120_opp_create(
 	struct dc_context *ctx,
 	uint32_t inst)
 {
@@ -437,7 +437,7 @@ struct output_pixel_processor *dce120_opp_create(
 			     ctx, inst, &opp_regs[inst], &opp_shift, &opp_mask);
 	return &opp->base;
 }
-struct dce_aux *dce120_aux_engine_create(
+static struct dce_aux *dce120_aux_engine_create(
 	struct dc_context *ctx,
 	uint32_t inst)
 {
@@ -475,7 +475,7 @@ static const struct dce_i2c_mask i2c_masks = {
 		I2C_COMMON_MASK_SH_LIST_DCE110(_MASK)
 };
 
-struct dce_i2c_hw *dce120_i2c_hw_create(
+static struct dce_i2c_hw *dce120_i2c_hw_create(
 	struct dc_context *ctx,
 	uint32_t inst)
 {