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_ctl.h

@@ -380,14 +380,6 @@ struct sde_hw_ctl_ops {
 	int (*update_bitmask)(struct sde_hw_ctl *ctx,
 			enum ctl_hw_flush_type type, u32 blk_idx, bool enable);
 
-	/**
-	 * read CTL_TOP register value and return
-	 * the data.
-	 * @ctx		: ctl path ctx pointer
-	 * @return	: CTL top register value
-	 */
-	u32 (*read_ctl_top)(struct sde_hw_ctl *ctx);
-
 	/**
 	 * get interfaces for the active CTL .
 	 * @ctx		: ctl path ctx pointer