drm/radeon/evergreen_cs: Move 'r600_dma_cs_next_reloc()'s prototype to shared header

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

drivers/gpu/drm/radeon/r600_cs.c:2343:5: warning: no previous prototype for ‘r600_dma_cs_next_reloc’ [-Wmissing-prototypes]
2343 | int r600_dma_cs_next_reloc(struct radeon_cs_parser *p,
| ^~~~~~~~~~~~~~~~~~~~~~

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_cs.c

···
 
 #include "radeon.h"
 #include "radeon_asic.h"
+#include "r600.h"
 #include "evergreend.h"
 #include "evergreen_reg_safe.h"
 #include "cayman_reg_safe.h"
···
 
 #define REG_SAFE_BM_SIZE ARRAY_SIZE(evergreen_reg_safe_bm)
 
-int r600_dma_cs_next_reloc(struct radeon_cs_parser *p,
-			   struct radeon_bo_list **cs_reloc);
 struct evergreen_cs_track {
 	u32			group_size;
 	u32			nbanks;

drivers/gpu/drm/radeon/r600.h

···
 #ifndef __R600_H__
 #define __R600_H__
 
+struct radeon_bo_list;
+struct radeon_cs_parser;
 struct radeon_device;
 
 u32 r600_gpu_check_soft_reset(struct radeon_device *rdev);
 int r600_ih_ring_alloc(struct radeon_device *rdev);
 void r600_ih_ring_fini(struct radeon_device *rdev);
 
+int r600_dma_cs_next_reloc(struct radeon_cs_parser *p,
+			   struct radeon_bo_list **cs_reloc);
 #endif				/* __R600_H__ */

drivers/gpu/drm/radeon/r600_cs.c

···
 
 #include "radeon.h"
 #include "radeon_asic.h"
+#include "r600.h"
 #include "r600d.h"
 #include "r600_reg_safe.h"