msm: kgsl: Add MMU clock enable and disable functions

Add mmu function pointers to control MMU specific clocks if any.

Change-Id: I3773a8e4afbac1caeb472d9e38289f9c35455904
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>
diff --git a/drivers/gpu/msm/kgsl_mmu.h b/drivers/gpu/msm/kgsl_mmu.h
index b476add..fc64629 100644
--- a/drivers/gpu/msm/kgsl_mmu.h
+++ b/drivers/gpu/msm/kgsl_mmu.h
@@ -130,6 +130,10 @@
 	void (*mmu_pagefault) (struct kgsl_mmu *mmu);
 	unsigned int (*mmu_get_current_ptbase)
 			(struct kgsl_mmu *mmu);
+	void (*mmu_disable_clk)
+		(struct kgsl_mmu *mmu);
+	int (*mmu_enable_clk)
+		(struct kgsl_mmu *mmu, int ctx_id);
 };
 
 struct kgsl_mmu_pt_ops {