drm/radeon/evergreen: Move 'cayman_*()'s prototypes to shared header

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

drivers/gpu/drm/radeon/ni.c:1378:6: warning: no previous prototype for ‘cayman_cp_int_cntl_setup’ [-Wmissing-prototypes]
1378 | void cayman_cp_int_cntl_setup(struct radeon_device *rdev,
| ^~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/radeon/ni.c:1732:5: warning: no previous prototype for ‘cayman_gpu_check_soft_reset’ [-Wmissing-prototypes]
1732 | u32 cayman_gpu_check_soft_reset(struct radeon_device *rdev)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~

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/evergreen.c

···
 
 #include "atom.h"
 #include "avivod.h"
+#include "ni.h"
 #include "rv770.h"
 #include "evergreen.h"
 #include "evergreen_blit_shaders.h"
···
 void evergreen_fini(struct radeon_device *rdev);
 void evergreen_pcie_gen2_enable(struct radeon_device *rdev);
 void evergreen_program_aspm(struct radeon_device *rdev);
-extern void cayman_cp_int_cntl_setup(struct radeon_device *rdev,
-				     int ring, u32 cp_int_cntl);
-extern void cayman_vm_decode_fault(struct radeon_device *rdev,
-				   u32 status, u32 addr);
 void cik_init_cp_pg_table(struct radeon_device *rdev);
 
 extern u32 si_get_csb_size(struct radeon_device *rdev);

drivers/gpu/drm/radeon/ni.c

···
 #include "cayman_blit_shaders.h"
 #include "clearstate_cayman.h"
 #include "evergreen.h"
+#include "ni.h"
 #include "ni_reg.h"
 #include "nid.h"
 #include "radeon.h"

drivers/gpu/drm/radeon/ni.h

···
+/* ni.h -- Private header for radeon driver -*- linux-c -*-
+ *
+ * Copyright 2010 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 (including the next
+ * paragraph) 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
+ * PRECISION INSIGHT AND/OR ITS SUPPLIERS 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 __NI_H__
+#define __NI_H__
+
+struct radeon_device;
+
+void cayman_cp_int_cntl_setup(struct radeon_device *rdev,
+			      int ring, u32 cp_int_cntl);
+void cayman_vm_decode_fault(struct radeon_device *rdev,
+			    u32 status, u32 addr);
+
+#endif				/* __NI_H__ */