drm/radeon/si_dpm: Move 'si_mc_load_microcode()'s prototype to shared header

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

drivers/gpu/drm/radeon/si.c:1570:5: warning: no previous prototype for ‘si_mc_load_microcode’ [-Wmissing-prototypes]

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/radeon/si.c

···
 #include "radeon_audio.h"
 #include "radeon_ucode.h"
 #include "si_blit_shaders.h"
+#include "si.h"
 #include "sid.h"
 
 

drivers/gpu/drm/radeon/si.h

···
+/* si.h -- Private header for radeon driver -*- linux-c -*-
+ *
+ * Copyright 2011 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __SI_H__
+#define __SI_H__
+
+struct radeon_device;
+
+int si_mc_load_microcode(struct radeon_device *rdev);
+
+#endif                         /* __SI_H__ */

drivers/gpu/drm/radeon/si_dpm.c

···
 #include "radeon_asic.h"
 #include "ni_dpm.h"
 #include "si_dpm.h"
+#include "si.h"
 #include "sid.h"
 
 #define MC_CG_ARB_FREQ_F0           0x0a
···
 
 struct evergreen_power_info *evergreen_get_pi(struct radeon_device *rdev);
 
-extern int si_mc_load_microcode(struct radeon_device *rdev);
 extern void vce_v1_0_enable_mgcg(struct radeon_device *rdev, bool enable);
 
 static int si_populate_voltage_value(struct radeon_device *rdev,