disp: msm: sde: remove unused functions from sde code

Cleanup unused functions from all modules in sde driver.

Change-Id: Ia0e72ab9c281b4200a63ce35bf184e83fe1db5d2
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>

msm/sde/sde_hw_pingpong.h

@@ -106,12 +106,6 @@ struct sde_hw_pingpong_ops {
 	 */
 	void (*disable_dsc)(struct sde_hw_pingpong *pp);
 
-	/**
-	 * Get DSC status
-	 * @Return: register value of DSC config
-	 */
-	u32 (*get_dsc_status)(struct sde_hw_pingpong *pp);
-
 	/**
 	 * Program the dither hw block
 	 */