drm/radeon/dpm: add new callbacks to get the current sclk/mclk

Needed to to expose the current clocks via the INFO ioctl.

Tested-by: Marek Olšák <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/radeon/radeon.h

···
 		u32 (*fan_ctrl_get_mode)(struct radeon_device *rdev);
 		int (*set_fan_speed_percent)(struct radeon_device *rdev, u32 speed);
 		int (*get_fan_speed_percent)(struct radeon_device *rdev, u32 *speed);
+		u32 (*get_current_sclk)(struct radeon_device *rdev);
+		u32 (*get_current_mclk)(struct radeon_device *rdev);
 	} dpm;
 	/* pageflipping */
 	struct {
···
 #define radeon_dpm_vblank_too_short(rdev) rdev->asic->dpm.vblank_too_short((rdev))
 #define radeon_dpm_powergate_uvd(rdev, g) rdev->asic->dpm.powergate_uvd((rdev), (g))
 #define radeon_dpm_enable_bapm(rdev, e) rdev->asic->dpm.enable_bapm((rdev), (e))
+#define radeon_dpm_get_current_sclk(rdev) rdev->asic->dpm.get_current_sclk((rdev))
+#define radeon_dpm_get_current_mclk(rdev) rdev->asic->dpm.get_current_mclk((rdev))
 
 /* Common functions */
 /* AGP */