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/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index dac32c8..07441cb 100644
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -2489,7 +2489,7 @@
 	.destroy = radeon_enc_destroy,
 };
 
-struct radeon_encoder_atom_dac *
+static struct radeon_encoder_atom_dac *
 radeon_atombios_set_dac_info(struct radeon_encoder *radeon_encoder)
 {
 	struct drm_device *dev = radeon_encoder->base.dev;
@@ -2503,7 +2503,7 @@
 	return dac;
 }
 
-struct radeon_encoder_atom_dig *
+static struct radeon_encoder_atom_dig *
 radeon_atombios_set_dig_info(struct radeon_encoder *radeon_encoder)
 {
 	int encoder_enum = (radeon_encoder->encoder_enum & ENUM_ID_MASK) >> ENUM_ID_SHIFT;