disp: msm: sde: avoid using spinlock for register log

Add support to use atomic variable instead of spinlock
for register logs during register write. This change
helps in reducing the run-time and is safe to use as
most of the register writes happen in commit context.

Change-Id: Ib7e377f80cbf437e391792b0b424cbd1eefdf497
Signed-off-by: Yashwanth <yvulapu@codeaurora.org>
Signed-off-by: Samantha Tran <samtran@codeaurora.org>

msm/sde_dbg.h

@@ -191,11 +191,10 @@ struct sde_dbg_reglog {
 	u32 first;
 	u32 last;
 	u32 last_dump;
-	u32 curr;
+	atomic64_t curr;
 	u32 next;
 	u32 enable;
 	u32 enable_mask;
-	spinlock_t spin_lock;
 };
 
 extern struct sde_dbg_reglog *sde_dbg_base_reglog;