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_gpummu.c b/drivers/gpu/msm/kgsl_gpummu.c
index 5a10654..b4dcf7c 100644
--- a/drivers/gpu/msm/kgsl_gpummu.c
+++ b/drivers/gpu/msm/kgsl_gpummu.c
@@ -725,6 +725,8 @@
 	.mmu_device_setstate = kgsl_gpummu_default_setstate,
 	.mmu_pagefault = kgsl_gpummu_pagefault,
 	.mmu_get_current_ptbase = kgsl_gpummu_get_current_ptbase,
+	.mmu_enable_clk = NULL,
+	.mmu_disable_clk = NULL,
 };
 
 struct kgsl_mmu_pt_ops gpummu_pt_ops = {