drm/radeon: update radeon_atom_get_voltage_table() for SI

SI uses a new atom table revision.  Required for DPM on SI.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index fdc36e8..c43b54b 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -242,7 +242,7 @@
 int radeon_atom_get_max_voltage(struct radeon_device *rdev,
 				u8 voltage_type, u16 *max_voltage);
 int radeon_atom_get_voltage_table(struct radeon_device *rdev,
-				  u8 voltage_type,
+				  u8 voltage_type, u8 voltage_mode,
 				  struct atom_voltage_table *voltage_table);
 bool radeon_atom_is_voltage_gpio(struct radeon_device *rdev,
 				 u8 voltage_type, u8 voltage_mode);