drm/amd/display: make mpc32_program_shaper and mpc32_program_3dlut static

These two functions are not used outside the function dcn32_mpc.c, so the
modification is defined as static.

drivers/gpu/drm/amd/amdgpu/../display/dc/dcn32/dcn32_mpc.c:704:6: warning: no previous prototype for ‘mpc32_program_shaper’.
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn32/dcn32_mpc.c:900:6: warning: no previous prototype for ‘mpc32_program_3dlut’.

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=2115Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_mpc.c

@@ -701,7 +701,7 @@ static void mpc32_power_on_shaper_3dlut(
 }
 
 
-bool mpc32_program_shaper(
+static bool mpc32_program_shaper(
 		struct mpc *mpc,
 		const struct pwl_params *params,
 		uint32_t mpcc_id)
@@ -897,7 +897,7 @@ static void mpc32_set_3dlut_mode(
 }
 
 
-bool mpc32_program_3dlut(
+static bool mpc32_program_3dlut(
 		struct mpc *mpc,
 		const struct tetrahedral_params *params,
 		int mpcc_id)