drm/radeon: Mark all possible functions / structs as static

Let's allow GCC to optimize better.

This exposed some five unused functions, but this patch doesn't remove them.

Signed-off-by: Lauri Kasanen <cand@gmx.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/r300.c b/drivers/gpu/drm/radeon/r300.c
index 646a192..4949bfc 100644
--- a/drivers/gpu/drm/radeon/r300.c
+++ b/drivers/gpu/drm/radeon/r300.c
@@ -296,7 +296,7 @@
 	radeon_ring_unlock_commit(rdev, ring);
 }
 
-void r300_errata(struct radeon_device *rdev)
+static void r300_errata(struct radeon_device *rdev)
 {
 	rdev->pll_errata = 0;
 
@@ -322,7 +322,7 @@
 	return -1;
 }
 
-void r300_gpu_init(struct radeon_device *rdev)
+static void r300_gpu_init(struct radeon_device *rdev)
 {
 	uint32_t gb_tile_config, tmp;